See
<https://ci.trafficserver.apache.org/job/freebsd_10-master/compiler=clang,label=freebsd_10,type=release/913/>
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checking whether we are using the GNU C compiler... yes
checking whether clang accepts -g... yes
checking for clang option to accept ISO C89... none needed
checking for style of include used by make... GNU
checking dependency style of clang... gcc3
checking whether we are using the GNU C++ compiler... yes
checking whether clang++ accepts -g... yes
checking dependency style of clang++... gcc3
checking whether clang and cc understand -c and -o together... yes
checking how to run the C preprocessor... clang -E
checking how to run the C++ preprocessor... clang++ -E
checking dependency style of clang... gcc3
checking for C compiler vendor... clang
checking whether clang++ supports C++11 features by default... yes
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checking the archiver (ar) interface... ar
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checking if the linker (/usr/bin/ld) is GNU ld... yes
checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm -B
checking the name lister (/usr/bin/nm -B) interface... BSD nm
checking the maximum length of command line arguments... 196608
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checking how to convert x86_64-unknown-freebsd10.1 file names to toolchain
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checking how to associate runtime and link libraries... printf %s\n
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checking for ranlib... ranlib
checking command to parse /usr/bin/nm -B output from clang object... ok
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checking whether the clang linker (/usr/bin/ld) supports shared libraries... yes
checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... freebsd10.1 ld.so
checking how to hardcode library paths into programs... immediate
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checking how to run the C++ preprocessor... clang++ -E
checking for ld used by clang++... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking whether the clang++ linker (/usr/bin/ld) supports shared libraries...
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checking whether the clang++ linker (/usr/bin/ld) supports shared libraries...
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checking dynamic linker characteristics... freebsd10.1 ld.so
checking how to hardcode library paths into programs... immediate
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checking for python... /usr/local/bin/python
checking for python version... 2.7
checking for python platform... freebsd10
checking for python script directory... ${prefix}/lib/python2.7/site-packages
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checking lex output file root... lex.yy
checking lex library... -lfl
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checking for perl module ExtUtils::MakeMaker... ok
checking checking whether to auto-set compiler optimization flags... yes -O3
checking size of void*... 0
configure: Build for host OS: freebsd10.1, arch: x86_64, optimization: freebsd
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configure: WARNING: openssl/ec.h: present but cannot be compiled
configure: WARNING: openssl/ec.h: check for missing prerequisite headers?
configure: WARNING: openssl/ec.h: see the Autoconf documentation
configure: WARNING: openssl/ec.h: section "Present But Cannot Be Compiled"
configure: WARNING: openssl/ec.h: proceeding with the compiler's result
configure: WARNING: ## ------------------------------------------- ##
configure: WARNING: ## Report this to [email protected] ##
configure: WARNING: ## ------------------------------------------- ##
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checking whether EC keys are supported... yes
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configure: WARNING: openssl/ssl.h: present but cannot be compiled
configure: WARNING: openssl/ssl.h: check for missing prerequisite headers?
configure: WARNING: openssl/ssl.h: see the Autoconf documentation
configure: WARNING: openssl/ssl.h: section "Present But Cannot Be Compiled"
configure: WARNING: openssl/ssl.h: proceeding with the compiler's result
configure: WARNING: ## ------------------------------------------- ##
configure: WARNING: ## Report this to [email protected] ##
configure: WARNING: ## ------------------------------------------- ##
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checking openssl/ts.h presence... yes
configure: WARNING: openssl/ts.h: present but cannot be compiled
configure: WARNING: openssl/ts.h: check for missing prerequisite headers?
configure: WARNING: openssl/ts.h: see the Autoconf documentation
configure: WARNING: openssl/ts.h: section "Present But Cannot Be Compiled"
configure: WARNING: openssl/ts.h: proceeding with the compiler's result
configure: WARNING: ## ------------------------------------------- ##
configure: WARNING: ## Report this to [email protected] ##
configure: WARNING: ## ------------------------------------------- ##
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checking for SSL_CTX_set_tlsext_servername_callback... no
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checking whether to enable ServerNameIndication TLS extension support... no
no
checking whether to enable Certificate callback support... no
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configure: WARNING: zlib.h: check for missing prerequisite headers?
configure: WARNING: zlib.h: see the Autoconf documentation
configure: WARNING: zlib.h: section "Present But Cannot Be Compiled"
configure: WARNING: zlib.h: proceeding with the compiler's result
configure: WARNING: ## ------------------------------------------- ##
configure: WARNING: ## Report this to [email protected] ##
configure: WARNING: ## ------------------------------------------- ##
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configure: WARNING: lzma.h: present but cannot be compiled
configure: WARNING: lzma.h: check for missing prerequisite headers?
configure: WARNING: lzma.h: see the Autoconf documentation
configure: WARNING: lzma.h: section "Present But Cannot Be Compiled"
configure: WARNING: lzma.h: proceeding with the compiler's result
configure: WARNING: ## ------------------------------------------- ##
configure: WARNING: ## Report this to [email protected] ##
configure: WARNING: ## ------------------------------------------- ##
checking for lzma.h... no
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checking for existence of /usr/local/lib/tcl8.6/tclConfig.sh... loading
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configure: WARNING: "Failed to find libxml2"
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configure: WARNING: expat.h: see the Autoconf documentation
configure: WARNING: expat.h: section "Present But Cannot Be Compiled"
configure: WARNING: expat.h: proceeding with the compiler's result
configure: WARNING: ## ------------------------------------------- ##
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configure: WARNING: ## ------------------------------------------- ##
checking for expat.h... no
configure: error: An XML parser (expat or libxml2) is required.
Build step 'Execute shell' marked build as failure
