> > > But I'd like to help debug this problem. Could you please, in a shell 
> > > where
> > > building manually works, run:
> > > $ source <envars.conf directory>/envars.conf
> > > 
> > > then build manually again, and report if it still works or not?
> > > 
> > > Pierre
> 
> Yes, I'm on it.

I got the results almost immediately. included in this email.

Alain
[  0%] Building CXX object lib/Demangle/CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o
[  0%] Building CXX object lib/TableGen/CMakeFiles/LLVMTableGen.dir/Error.cpp.o
[  0%] Built target LLVMHello_exports
[  0%] Built target llvm_vcsrevision_h
[  0%] Building CXX object lib/BinaryFormat/CMakeFiles/LLVMBinaryFormat.dir/Dwarf.cpp.o
[  0%] Building CXX object lib/MC/MCParser/CMakeFiles/LLVMMCParser.dir/AsmLexer.cpp.o
[  0%] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/AMDGPUMetadata.cpp.o
[  0%] Building CXX object utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/AsmMatcherEmitter.cpp.o
[  0%] Building CXX object lib/MC/MCParser/CMakeFiles/LLVMMCParser.dir/AsmParser.cpp.o
[  0%] Building CXX object lib/TableGen/CMakeFiles/LLVMTableGen.dir/Main.cpp.o
[  0%] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/ConstantPools.cpp.o
Scanning dependencies of target LLVMMCDisassembler
[  0%] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/APFloat.cpp.o
[  0%] Building CXX object lib/BinaryFormat/CMakeFiles/LLVMBinaryFormat.dir/Magic.cpp.o
[  0%] Building CXX object lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/Disassembler.cpp.o
[  0%] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/APInt.cpp.o
[  0%] Building CXX object lib/MC/CMakeFiles/LLVMMC.dir/ELFObjectWriter.cpp.o
[  0%] Building CXX object lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/MCDisassembler.cpp.o
[  0%] Building CXX object lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/MCExternalSymbolizer.cpp.o
[  0%] Building CXX object lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/MCRelocationInfo.cpp.o
[  0%] Building CXX object utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/AsmWriterEmitter.cpp.o
[  0%] Building CXX object lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/MCSymbolizer.cpp.o
[  0%] Building CXX object utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/AsmWriterInst.cpp.o
[  0%] Building CXX object utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/Attributes.cpp.o
[  0%] Building CXX object utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/CallingConvEmitter.cpp.o
[  0%] Building CXX object utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/CodeEmitterGen.cpp.o
[  0%] Building CXX object utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/CodeGenDAGPatterns.cpp.o
In file included from /home/alain/llvm-6.0.0.src/build/include/llvm/Support/DataTypes.h:33:0,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/Hashing.h:48,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/ArrayRef.h:13,
                 from /home/alain/llvm-6.0.0.src/include/llvm/Support/SourceMgr.h:19,
                 from /home/alain/llvm-6.0.0.src/include/llvm/TableGen/Error.h:18,
                 from /home/alain/llvm-6.0.0.src/lib/TableGen/Error.cpp:15:
/usr/include/c++/7.3.0/cmath:45:15: erreur fatale: math.h : Aucun fichier ou dossier de ce type
 #include_next <math.h>
               ^~~~~~~~
compilation terminée.
In file included from /usr/include/c++/7.3.0/bits/stl_algo.h:59:0,
                 from /usr/include/c++/7.3.0/algorithm:62,
                 from /home/alain/llvm-6.0.0.src/lib/Demangle/ItaniumDemangle.cpp:17:
/usr/include/c++/7.3.0/cstdlib:75:15: erreur fatale: stdlib.h : Aucun fichier ou dossier de ce type
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminée.
make[2]: *** [lib/Demangle/CMakeFiles/LLVMDemangle.dir/build.make:63: lib/Demangle/CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:550: lib/Demangle/CMakeFiles/LLVMDemangle.dir/all] Error 2
make[2]: *** [lib/TableGen/CMakeFiles/LLVMTableGen.dir/build.make:63: lib/TableGen/CMakeFiles/LLVMTableGen.dir/Error.cpp.o] Error 1
make[1]: *** Attente des tâches non terminées....
make[2]: *** Attente des tâches non terminées....
In file included from /usr/include/c++/7.3.0/bits/stl_algo.h:59:0,
                 from /usr/include/c++/7.3.0/algorithm:62,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/Optional.h:23,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/STLExtras.h:20,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/StringRef.h:13,
                 from /home/alain/llvm-6.0.0.src/include/llvm/MC/MCParser/AsmLexer.h:17,
                 from /home/alain/llvm-6.0.0.src/lib/MC/MCParser/AsmLexer.cpp:14:
/usr/include/c++/7.3.0/cstdlib:75:15: erreur fatale: stdlib.h : Aucun fichier ou dossier de ce type
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminée.
make[2]: *** [lib/MC/MCParser/CMakeFiles/LLVMMCParser.dir/build.make:63: lib/MC/MCParser/CMakeFiles/LLVMMCParser.dir/AsmLexer.cpp.o] Error 1
In file included from /home/alain/llvm-6.0.0.src/build/include/llvm/Support/DataTypes.h:33:0,
                 from /home/alain/llvm-6.0.0.src/include/llvm/Support/SwapByteOrder.h:19,
                 from /home/alain/llvm-6.0.0.src/include/llvm/Support/MathExtras.h:18,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/APInt.h:20,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/APFloat.h:20,
                 from /home/alain/llvm-6.0.0.src/lib/MC/MCParser/AsmParser.cpp:14:
/usr/include/c++/7.3.0/cmath:45:15: erreur fatale: math.h : Aucun fichier ou dossier de ce type
 #include_next <math.h>
               ^~~~~~~~
compilation terminée.
make[2]: *** Attente des tâches non terminées....
make[2]: *** [lib/MC/MCParser/CMakeFiles/LLVMMCParser.dir/build.make:76: lib/MC/MCParser/CMakeFiles/LLVMMCParser.dir/AsmParser.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:4233: lib/MC/MCParser/CMakeFiles/LLVMMCParser.dir/all] Error 2
In file included from /usr/include/c++/7.3.0/bits/stl_algo.h:59:0,
                 from /usr/include/c++/7.3.0/algorithm:62,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/Optional.h:23,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/STLExtras.h:20,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/StringRef.h:13,
                 from /home/alain/llvm-6.0.0.src/lib/TableGen/TGLexer.h:17,
                 from /home/alain/llvm-6.0.0.src/lib/TableGen/TGParser.h:17,
                 from /home/alain/llvm-6.0.0.src/lib/TableGen/Main.cpp:19:
/usr/include/c++/7.3.0/cstdlib:75:15: erreur fatale: stdlib.h : Aucun fichier ou dossier de ce type
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminée.
make[2]: *** [lib/TableGen/CMakeFiles/LLVMTableGen.dir/build.make:76: lib/TableGen/CMakeFiles/LLVMTableGen.dir/Main.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:824: lib/TableGen/CMakeFiles/LLVMTableGen.dir/all] Error 2
In file included from /home/alain/llvm-6.0.0.src/build/include/llvm/Support/DataTypes.h:33:0,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/Hashing.h:48,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/ArrayRef.h:13,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/DenseMapInfo.h:17,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/DenseMap.h:17,
                 from /home/alain/llvm-6.0.0.src/include/llvm/MC/ConstantPools.h:17,
                 from /home/alain/llvm-6.0.0.src/lib/MC/ConstantPools.cpp:14:
/usr/include/c++/7.3.0/cmath:45:15: erreur fatale: math.h : Aucun fichier ou dossier de ce type
 #include_next <math.h>
               ^~~~~~~~
compilation terminée.
In file included from /home/alain/llvm-6.0.0.src/build/include/llvm/Support/DataTypes.h:33:0,
                 from /home/alain/llvm-6.0.0.src/include/llvm/BinaryFormat/Dwarf.h:24,
                 from /home/alain/llvm-6.0.0.src/lib/BinaryFormat/Dwarf.cpp:14:
/usr/include/c++/7.3.0/cmath:45:15: erreur fatale: math.h : Aucun fichier ou dossier de ce type
 #include_next <math.h>
               ^~~~~~~~
compilation terminée.
make[2]: *** [lib/BinaryFormat/CMakeFiles/LLVMBinaryFormat.dir/build.make:63: lib/BinaryFormat/CMakeFiles/LLVMBinaryFormat.dir/Dwarf.cpp.o] Error 1
make[2]: *** [lib/MC/CMakeFiles/LLVMMC.dir/build.make:63: lib/MC/CMakeFiles/LLVMMC.dir/ConstantPools.cpp.o] Error 1
make[2]: *** Attente des tâches non terminées....
make[2]: *** Attente des tâches non terminées....
In file included from /home/alain/llvm-6.0.0.src/build/include/llvm/Support/DataTypes.h:33:0,
                 from /home/alain/llvm-6.0.0.src/include/llvm/Support/SwapByteOrder.h:19,
                 from /home/alain/llvm-6.0.0.src/include/llvm/Support/MathExtras.h:18,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/APInt.h:20,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/APFloat.h:20,
                 from /home/alain/llvm-6.0.0.src/lib/Support/APFloat.cpp:15:
/usr/include/c++/7.3.0/cmath:45:15: erreur fatale: math.h : Aucun fichier ou dossier de ce type
 #include_next <math.h>
               ^~~~~~~~
compilation terminée.
make[2]: *** [lib/Support/CMakeFiles/LLVMSupport.dir/build.make:76: lib/Support/CMakeFiles/LLVMSupport.dir/APFloat.cpp.o] Error 1
make[2]: *** Attente des tâches non terminées....
In file included from /usr/include/c++/7.3.0/bits/stl_algo.h:59:0,
                 from /usr/include/c++/7.3.0/algorithm:62,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/Optional.h:23,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/STLExtras.h:20,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/StringRef.h:13,
                 from /home/alain/llvm-6.0.0.src/include/llvm/BinaryFormat/Magic.h:13,
                 from /home/alain/llvm-6.0.0.src/lib/BinaryFormat/Magic.cpp:10:
/usr/include/c++/7.3.0/cstdlib:75:15: erreur fatale: stdlib.h : Aucun fichier ou dossier de ce type
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminée.
make[2]: *** [lib/BinaryFormat/CMakeFiles/LLVMBinaryFormat.dir/build.make:76: lib/BinaryFormat/CMakeFiles/LLVMBinaryFormat.dir/Magic.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:2228: lib/BinaryFormat/CMakeFiles/LLVMBinaryFormat.dir/all] Error 2
In file included from /home/alain/llvm-6.0.0.src/build/include/llvm/Support/DataTypes.h:33:0,
                 from /home/alain/llvm-6.0.0.src/include/llvm/Support/SwapByteOrder.h:19,
                 from /home/alain/llvm-6.0.0.src/include/llvm/Support/MathExtras.h:18,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/APInt.h:20,
                 from /home/alain/llvm-6.0.0.src/lib/Support/APInt.cpp:15:
/usr/include/c++/7.3.0/cmath:45:15: erreur fatale: math.h : Aucun fichier ou dossier de ce type
 #include_next <math.h>
               ^~~~~~~~
compilation terminée.
make[2]: *** [lib/Support/CMakeFiles/LLVMSupport.dir/build.make:89: lib/Support/CMakeFiles/LLVMSupport.dir/APInt.cpp.o] Error 1
In file included from /usr/include/c++/7.3.0/ext/string_conversions.h:41:0,
                 from /usr/include/c++/7.3.0/bits/basic_string.h:6349,
                 from /usr/include/c++/7.3.0/string:52,
                 from /usr/include/c++/7.3.0/bits/locale_classes.h:40,
                 from /usr/include/c++/7.3.0/bits/ios_base.h:41,
                 from /usr/include/c++/7.3.0/ios:42,
                 from /usr/include/c++/7.3.0/ostream:38,
                 from /usr/include/c++/7.3.0/iterator:64,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/iterator_range.h:22,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/SmallVector.h:17,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/Twine.h:13,
                 from /home/alain/llvm-6.0.0.src/lib/Support/AMDGPUMetadata.cpp:16:
/usr/include/c++/7.3.0/cstdlib:75:15: erreur fatale: stdlib.h : Aucun fichier ou dossier de ce type
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminée.
make[2]: *** [lib/Support/CMakeFiles/LLVMSupport.dir/build.make:63: lib/Support/CMakeFiles/LLVMSupport.dir/AMDGPUMetadata.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:735: lib/Support/CMakeFiles/LLVMSupport.dir/all] Error 2
In file included from /home/alain/llvm-6.0.0.src/build/include/llvm/Support/DataTypes.h:33:0,
                 from /home/alain/llvm-6.0.0.src/include/llvm-c/Disassembler.h:18,
                 from /home/alain/llvm-6.0.0.src/lib/MC/MCDisassembler/Disassembler.h:20,
                 from /home/alain/llvm-6.0.0.src/lib/MC/MCDisassembler/Disassembler.cpp:10:
/usr/include/c++/7.3.0/cmath:45:15: erreur fatale: math.h : Aucun fichier ou dossier de ce type
 #include_next <math.h>
               ^~~~~~~~
compilation terminée.
make[2]: *** [lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/build.make:63: lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/Disassembler.cpp.o] Error 1
make[2]: *** Attente des tâches non terminées....
In file included from /home/alain/llvm-6.0.0.src/build/include/llvm/Support/DataTypes.h:33:0,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/Hashing.h:48,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/ArrayRef.h:13,
                 from /home/alain/llvm-6.0.0.src/lib/MC/ELFObjectWriter.cpp:14:
/usr/include/c++/7.3.0/cmath:45:15: erreur fatale: math.h : Aucun fichier ou dossier de ce type
 #include_next <math.h>
               ^~~~~~~~
compilation terminée.
make[2]: *** [lib/MC/CMakeFiles/LLVMMC.dir/build.make:76: lib/MC/CMakeFiles/LLVMMC.dir/ELFObjectWriter.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:4080: lib/MC/CMakeFiles/LLVMMC.dir/all] Error 2
In file included from /usr/include/c++/7.3.0/bits/stl_algo.h:59:0,
                 from /usr/include/c++/7.3.0/algorithm:62,
                 from /home/alain/llvm-6.0.0.src/include/llvm/MC/MCDisassembler/MCSymbolizer.h:20,
                 from /home/alain/llvm-6.0.0.src/include/llvm/MC/MCDisassembler/MCDisassembler.h:13,
                 from /home/alain/llvm-6.0.0.src/lib/MC/MCDisassembler/MCDisassembler.cpp:10:
/usr/include/c++/7.3.0/cstdlib:75:15: erreur fatale: stdlib.h : Aucun fichier ou dossier de ce type
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminée.
make[2]: *** [lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/build.make:76: lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/MCDisassembler.cpp.o] Error 1
In file included from /home/alain/llvm-6.0.0.src/build/include/llvm/Support/DataTypes.h:33:0,
                 from /home/alain/llvm-6.0.0.src/include/llvm-c/Disassembler.h:18,
                 from /home/alain/llvm-6.0.0.src/include/llvm/MC/MCDisassembler/MCExternalSymbolizer.h:19,
                 from /home/alain/llvm-6.0.0.src/lib/MC/MCDisassembler/MCExternalSymbolizer.cpp:10:
/usr/include/c++/7.3.0/cmath:45:15: erreur fatale: math.h : Aucun fichier ou dossier de ce type
 #include_next <math.h>
               ^~~~~~~~
compilation terminée.
make[2]: *** [lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/build.make:89: lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/MCExternalSymbolizer.cpp.o] Error 1
In file included from /home/alain/llvm-6.0.0.src/build/include/llvm/Support/DataTypes.h:33:0,
                 from /home/alain/llvm-6.0.0.src/include/llvm-c/Disassembler.h:18,
                 from /home/alain/llvm-6.0.0.src/lib/MC/MCDisassembler/MCRelocationInfo.cpp:11:
/usr/include/c++/7.3.0/cmath:45:15: erreur fatale: math.h : Aucun fichier ou dossier de ce type
 #include_next <math.h>
               ^~~~~~~~
compilation terminée.
make[2]: *** [lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/build.make:102: lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/MCRelocationInfo.cpp.o] Error 1
In file included from /usr/include/c++/7.3.0/bits/stl_algo.h:59:0,
                 from /usr/include/c++/7.3.0/algorithm:62,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/Optional.h:23,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/STLExtras.h:20,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/StringRef.h:13,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/StringMap.h:17,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/CodeGenHwModes.h:15,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/CodeGenTarget.h:20,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/AsmMatcherEmitter.cpp:99:
/usr/include/c++/7.3.0/cstdlib:75:15: erreur fatale: stdlib.h : Aucun fichier ou dossier de ce type
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminée.
make[2]: *** [utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/build.make:63: utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/AsmMatcherEmitter.cpp.o] Error 1
make[2]: *** Attente des tâches non terminées....
In file included from /home/alain/llvm-6.0.0.src/build/include/llvm/Support/DataTypes.h:33:0,
                 from /home/alain/llvm-6.0.0.src/include/llvm-c/Types.h:17,
                 from /home/alain/llvm-6.0.0.src/include/llvm/Support/MemoryBuffer.h:17,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/Attributes.cpp:10:
/usr/include/c++/7.3.0/cmath:45:15: erreur fatale: math.h : Aucun fichier ou dossier de ce type
 #include_next <math.h>
               ^~~~~~~~
compilation terminée.
In file included from /usr/include/c++/7.3.0/bits/stl_algo.h:59:0,
                 from /usr/include/c++/7.3.0/algorithm:62,
                 from /home/alain/llvm-6.0.0.src/include/llvm/MC/MCDisassembler/MCSymbolizer.h:20,
                 from /home/alain/llvm-6.0.0.src/lib/MC/MCDisassembler/MCSymbolizer.cpp:10:
/usr/include/c++/7.3.0/cstdlib:75:15: erreur fatale: stdlib.h : Aucun fichier ou dossier de ce type
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminée.
make[2]: *** [utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/build.make:102: utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/Attributes.cpp.o] Error 1
make[2]: *** [lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/build.make:115: lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/MCSymbolizer.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:4354: lib/MC/MCDisassembler/CMakeFiles/LLVMMCDisassembler.dir/all] Error 2
In file included from /usr/include/c++/7.3.0/ext/string_conversions.h:41:0,
                 from /usr/include/c++/7.3.0/bits/basic_string.h:6349,
                 from /usr/include/c++/7.3.0/string:52,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/AsmWriterInst.h:20,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/AsmWriterEmitter.cpp:15:
/usr/include/c++/7.3.0/cstdlib:75:15: erreur fatale: stdlib.h : Aucun fichier ou dossier de ce type
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminée.
make[2]: *** [utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/build.make:76: utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/AsmWriterEmitter.cpp.o] Error 1
In file included from /usr/include/c++/7.3.0/bits/stl_algo.h:59:0,
                 from /usr/include/c++/7.3.0/algorithm:62,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/Optional.h:23,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/STLExtras.h:20,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/StringRef.h:13,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/CodeGenInstruction.h:17,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/CodeEmitterGen.cpp:16:
/usr/include/c++/7.3.0/cstdlib:75:15: erreur fatale: stdlib.h : Aucun fichier ou dossier de ce type
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminée.
make[2]: *** [utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/build.make:128: utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/CodeEmitterGen.cpp.o] Error 1
In file included from /usr/include/c++/7.3.0/bits/stl_algo.h:59:0,
                 from /usr/include/c++/7.3.0/algorithm:62,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/Optional.h:23,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/STLExtras.h:20,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/StringRef.h:13,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/StringMap.h:17,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/CodeGenHwModes.h:15,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/CodeGenTarget.h:20,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/CallingConvEmitter.cpp:15:
/usr/include/c++/7.3.0/cstdlib:75:15: erreur fatale: stdlib.h : Aucun fichier ou dossier de ce type
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminée.
make[2]: *** [utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/build.make:115: utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/CallingConvEmitter.cpp.o] Error 1
In file included from /usr/include/c++/7.3.0/ext/string_conversions.h:41:0,
                 from /usr/include/c++/7.3.0/bits/basic_string.h:6349,
                 from /usr/include/c++/7.3.0/string:52,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/AsmWriterInst.h:20,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/AsmWriterInst.cpp:14:
/usr/include/c++/7.3.0/cstdlib:75:15: erreur fatale: stdlib.h : Aucun fichier ou dossier de ce type
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminée.
make[2]: *** [utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/build.make:89: utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/AsmWriterInst.cpp.o] Error 1
In file included from /usr/include/c++/7.3.0/bits/stl_algo.h:59:0,
                 from /usr/include/c++/7.3.0/algorithm:62,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/Optional.h:23,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/STLExtras.h:20,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/StringRef.h:13,
                 from /home/alain/llvm-6.0.0.src/include/llvm/ADT/StringMap.h:17,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/CodeGenHwModes.h:15,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/CodeGenDAGPatterns.h:18,
                 from /home/alain/llvm-6.0.0.src/utils/TableGen/CodeGenDAGPatterns.cpp:15:
/usr/include/c++/7.3.0/cstdlib:75:15: erreur fatale: stdlib.h : Aucun fichier ou dossier de ce type
 #include_next <stdlib.h>
               ^~~~~~~~~~
compilation terminée.
make[2]: *** [utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/build.make:141: utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/CodeGenDAGPatterns.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:952: utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/all] Error 2
make: *** [Makefile:152: all] Error 2
-- 
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