Build error on R1917

[Blake McBride]

I get the following on Fedora:

/bin/sh ../libtool  --tag=CXX   --mode=link g++ -Wall  -I sql -I
/home/blake/Backup/apl     -I/usr/include -I/usr/include
 -Wno-maybe-uninitialized -Wno-class-memaccess -I /home/blake/Backup/apl
-L/usr/local/lib -export-dynamic  -L/usr/lib -lsqlite3 -L/usr/lib64 -lpq
 -o apl apl-main.o apl-Plot_xcb.o apl-Archive.o apl-Assert.o apl-Avec.o
apl-Backtrace.o apl-Bif_F12_COMMA.o apl-Bif_F12_DOMINO.o
apl-Bif_F12_INDEX_OF.o apl-Bif_F12_INTERVAL_INDEX.o apl-Bif_F12_FORMAT.o
apl-Bif_F12_PARTITION_PICK.o apl-Bif_F12_SORT.o apl-Bif_F12_TAKE_DROP.o
apl-Bif_OPER1_COMMUTE.o apl-Bif_OPER1_EACH.o apl-Bif_OPER2_POWER.o
apl-Bif_OPER2_INNER.o apl-Bif_OPER2_OUTER.o apl-Bif_OPER2_RANK.o
apl-Bif_OPER1_REDUCE.o apl-Bif_OPER1_SCAN.o apl-CDR.o apl-Cell.o apl-Doxy.o
apl-CharCell.o apl-Command.o apl-Common.o apl-ComplexCell.o
apl-DerivedFunction.o apl-DiffOut.o apl-DynamicObject.o apl-Error.o
apl-Executable.o apl-FloatCell.o apl-Function.o apl-Id.o apl-IndexExpr.o
apl-IndexIterator.o apl-InputFile.o apl-IntCell.o apl-IO_Files.o
apl-LApack.o apl-LibPaths.o apl-LineInput.o apl-Logging.o apl-LvalCell.o
apl-Malloc_hooks.o apl-Nabla.o apl-Macro.o apl-Missing_Libraries.o
apl-NamedObject.o apl-NativeFunction.o apl-NumericCell.o apl-Output.o
apl-Parallel.o apl-Parser.o apl-Performance.o apl-PointerCell.o
apl-Prefix.o apl-Plot_line_properties.o apl-Plot_data.o
apl-Plot_window_properties.o apl-PrimitiveFunction.o apl-PrintBuffer.o
apl-QR_factorization_GSL.o apl-QuadFunction.o apl-ProcessorID.o
apl-Quad_CR.o apl-Quad_DLX.o apl-Quad_FFT.o apl-Quad_FIO.o apl-Quad_FX.o
apl-Quad_GTK.o apl-Quad_JSON.o apl-Quad_MAP.o apl-Quad_MX.o apl-Quad_PLOT.o
apl-Quad_PNG.o apl-Quad_RE.o apl-Quad_RL.o apl-Quad_RVAL.o apl-Quad_SQL.o
apl-Quad_SVx.o apl-Quad_TF.o apl-Quad_WA.o apl-Quad_XML.o apl-RealCell.o
apl-sbrk.o apl-Shape.o apl-ScalarFunction.o apl-Security.o
apl-StateIndicator.o apl-Svar_DB.o apl-Svar_record.o apl-Symbol.o
apl-SymbolTable.o apl-SystemVariable.o apl-TabExpansion.o
apl-Thread_context.o apl-Token.o apl-Tokenizer.o apl-UCS_string.o
apl-UCS_string_vector.o apl-UserFunction.o apl-UserFunction_header.o
apl-UserPreferences.o apl-UTF8_string.o apl-Value.o apl-ValueHistory.o
apl-Workspace.o apl-static_Objects.o apl-Regexp.o
sql/apl-SqliteArgListBuilder.o sql/apl-SqliteConnection.o
sql/apl-SqliteResultValue.o sql/apl-SqliteProvider.o sql/apl-Connection.o
 sql/apl-PostgresArgListBuilder.o sql/apl-PostgresConnection.o
sql/apl-PostgresProvider.o -lpcre2-32 -lz -lpng -lX11-xcb -lxcb -lX11 -lc
-ldl -lm -lncurses -lcurses -lpthread -ltinfo  -lpcre2-32 -lz -lpng
-lX11-xcb -lxcb -lX11 -lc -ldl -lm -lncurses -lcurses -lpthread -ltinfo
libtool: link: g++ -Wall -I sql -I /home/blake/Backup/apl -I/usr/include
-I/usr/include -Wno-maybe-uninitialized -Wno-class-memaccess -I
/home/blake/Backup/apl -o apl apl-main.o apl-Plot_xcb.o apl-Archive.o
apl-Assert.o apl-Avec.o apl-Backtrace.o apl-Bif_F12_COMMA.o
apl-Bif_F12_DOMINO.o apl-Bif_F12_INDEX_OF.o apl-Bif_F12_INTERVAL_INDEX.o
apl-Bif_F12_FORMAT.o apl-Bif_F12_PARTITION_PICK.o apl-Bif_F12_SORT.o
apl-Bif_F12_TAKE_DROP.o apl-Bif_OPER1_COMMUTE.o apl-Bif_OPER1_EACH.o
apl-Bif_OPER2_POWER.o apl-Bif_OPER2_INNER.o apl-Bif_OPER2_OUTER.o
apl-Bif_OPER2_RANK.o apl-Bif_OPER1_REDUCE.o apl-Bif_OPER1_SCAN.o apl-CDR.o
apl-Cell.o apl-Doxy.o apl-CharCell.o apl-Command.o apl-Common.o
apl-ComplexCell.o apl-DerivedFunction.o apl-DiffOut.o apl-DynamicObject.o
apl-Error.o apl-Executable.o apl-FloatCell.o apl-Function.o apl-Id.o
apl-IndexExpr.o apl-IndexIterator.o apl-InputFile.o apl-IntCell.o
apl-IO_Files.o apl-LApack.o apl-LibPaths.o apl-LineInput.o apl-Logging.o
apl-LvalCell.o apl-Malloc_hooks.o apl-Nabla.o apl-Macro.o
apl-Missing_Libraries.o apl-NamedObject.o apl-NativeFunction.o
apl-NumericCell.o apl-Output.o apl-Parallel.o apl-Parser.o
apl-Performance.o apl-PointerCell.o apl-Prefix.o apl-Plot_line_properties.o
apl-Plot_data.o apl-Plot_window_properties.o apl-PrimitiveFunction.o
apl-PrintBuffer.o apl-QR_factorization_GSL.o apl-QuadFunction.o
apl-ProcessorID.o apl-Quad_CR.o apl-Quad_DLX.o apl-Quad_FFT.o
apl-Quad_FIO.o apl-Quad_FX.o apl-Quad_GTK.o apl-Quad_JSON.o apl-Quad_MAP.o
apl-Quad_MX.o apl-Quad_PLOT.o apl-Quad_PNG.o apl-Quad_RE.o apl-Quad_RL.o
apl-Quad_RVAL.o apl-Quad_SQL.o apl-Quad_SVx.o apl-Quad_TF.o apl-Quad_WA.o
apl-Quad_XML.o apl-RealCell.o apl-sbrk.o apl-Shape.o apl-ScalarFunction.o
apl-Security.o apl-StateIndicator.o apl-Svar_DB.o apl-Svar_record.o
apl-Symbol.o apl-SymbolTable.o apl-SystemVariable.o apl-TabExpansion.o
apl-Thread_context.o apl-Token.o apl-Tokenizer.o apl-UCS_string.o
apl-UCS_string_vector.o apl-UserFunction.o apl-UserFunction_header.o
apl-UserPreferences.o apl-UTF8_string.o apl-Value.o apl-ValueHistory.o
apl-Workspace.o apl-static_Objects.o apl-Regexp.o
sql/apl-SqliteArgListBuilder.o sql/apl-SqliteConnection.o
sql/apl-SqliteResultValue.o sql/apl-SqliteProvider.o sql/apl-Connection.o
sql/apl-PostgresArgListBuilder.o sql/apl-PostgresConnection.o
sql/apl-PostgresProvider.o -Wl,--export-dynamic  -L/usr/local/lib
-L/usr/lib -lsqlite3 -L/usr/lib64 -lpq -lpcre2-32 -lz -lpng -lX11-xcb -lxcb
-lX11 -lc -ldl -lm -lncurses -lcurses -lpthread -ltinfo
/usr/bin/ld: apl-Quad_FFT.o: in function `Quad_FFT::Quad_FFT()':
Quad_FFT.cc:(.text+0x1e): undefined reference to `vtable for Quad_FFT'
/usr/bin/ld: Quad_FFT.cc:(.text+0x2a): undefined reference to `vtable for
Quad_FFT'
/usr/bin/ld: apl-Quad_FFT.o: in function `Quad_FFT::~Quad_FFT()':
Quad_FFT.cc:(.text._ZN8Quad_FFTD2Ev[_ZN8Quad_FFTD5Ev]+0xd): undefined
reference to `vtable for Quad_FFT'
/usr/bin/ld: Quad_FFT.cc:(.text._ZN8Quad_FFTD2Ev[_ZN8Quad_FFTD5Ev]+0x19):
undefined reference to `vtable for Quad_FFT'
collect2: error: ld returned 1 exit status
make[3]: *** [Makefile:1567: apl] Error 1
make[3]: Leaving directory '/drive1/ROOT/home/blake/Backup/apl/src'
make[2]: *** [Makefile:5425: all-recursive] Error 1
make[2]: Leaving directory '/drive1/ROOT/home/blake/Backup/apl/src'
make[1]: *** [Makefile:556: all-recursive] Error 1
make[1]: Leaving directory '/drive1/ROOT/home/blake/Backup/apl'
make: *** [Makefile:444: all] Error 2