Hello, 123456789012345678901234567890123456789012345678901234567890123456 I have problem building cpp with my installation of gcc 4.3.0, which I built from source. The specific problem in this case is that it can't find the system wctype.h, but I don't know if it applies to other system header files. This is using GoboLinux, so paths may differ from "normal" systems, but files should be available where expected. Header files is found in /System/Links/Headers (as symbolic links) and wctype.h (the file g++ can't find) is located there: $ls -l /System/Links/Headers/wctype.h lrwxrwxrwx 1 gobo gobo 44 May 5 03:35 /System/Links/Headers/wctype.h -> ../../../Programs/Glibc/2.8/include/wctype.h $ls -l /Programs/Glibc/2.8/include/wctype.h -rw-r--r-- 1 1000 100 11208 May 3 13:02 /Programs/Glibc/2.8/include/wctype.h CPLUS_INCLUDE_PATH is set to /System/Links/Headers. Also /usr/include is a symlink to /System/Links/Headers, so if any binary uses that as absolute path it should find the files. This is applied to /include and /usr/local/include as well. Though this shouldn't matter as g++ searches /System/Links/Headers, as can be seen below. To workaround reading symlinks I also tried the below compilation with '-I/Programs/Glibc/2.8/include', which had no more effect than adding it to the top of <...> include search paths, but still I got the same error. What is wrong with my install? $cat something.cpp #include <cwctype> $g++ -v -c something.cpp Using built-in specs. Target: i686-pc-linux-gnu Configured with: /Files/Compile/Sources/gcc-4.3.0/./configure --prefix=/Programs/GCC/4.3.0 --sysconfdir=/Programs/GCC/Settings --localstatedir=/System/Variable --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --enable-languages=c,c++ Thread model: posix gcc version 4.3.0 (GCC) COLLECT_GCC_OPTIONS='-v' '-c' '-shared-libgcc' '-mtune=generic' /Programs/GCC/Current/lib/gcc/../../libexec/gcc/i686-pc-linux-gnu/4.3.0/cc1plus -quiet -v -iprefix /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/ -D_GNU_SOURCE something.cpp -quiet -dumpbase something.cpp -mtune=generic -auxbase something -version -o /tmp/ccSRJghe.s ignoring nonexistent directory "/Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../i686-pc-linux-gnu/include" ignoring duplicate directory "/Programs/GCC/Current/lib/gcc/../../lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0" ignoring duplicate directory "/Programs/GCC/Current/lib/gcc/../../lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/i686-pc-linux-gnu" ignoring duplicate directory "/Programs/GCC/Current/lib/gcc/../../lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/backward" ignoring duplicate directory "/usr/local/include" ignoring duplicate directory "/Programs/GCC/Current/lib/gcc/../../lib/gcc/i686-pc-linux-gnu/4.3.0/include" ignoring duplicate directory "/Programs/GCC/Current/lib/gcc/../../lib/gcc/i686-pc-linux-gnu/4.3.0/include-fixed" ignoring nonexistent directory "/Programs/GCC/Current/lib/gcc/../../lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../i686-pc-linux-gnu/include" ignoring duplicate directory "/usr/include" #include "..." search starts here: #include <...> search starts here: /System/Links/Headers /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0 /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/i686-pc-linux-gnu /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/backward /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/include /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/include-fixed /Programs/GCC/Current/lib/gcc/../../include End of search list. GNU C++ (GCC) version 4.3.0 (i686-pc-linux-gnu) compiled by GNU C version 4.3.0, GMP version 4.2.2, MPFR version 2.3.1. GGC heuristics: --param ggc-min-expand=98 --param ggc-min-heapsize=128941 Compiler executable checksum: 9e6a2619db6686469cb158722d901958 In file included from something.cpp:1: /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:51:25: error: wctype.h: No such file or directory In file included from something.cpp:1: /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:83: error: '::wctrans_t' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:84: error: '::wctype_t' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:85: error: '::wint_t' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:87: error: '::iswalnum' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:88: error: '::iswalpha' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:90: error: '::iswblank' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:92: error: '::iswcntrl' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:93: error: '::iswctype' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:94: error: '::iswdigit' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:95: error: '::iswgraph' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:96: error: '::iswlower' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:97: error: '::iswprint' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:98: error: '::iswpunct' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:99: error: '::iswspace' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:100: error: '::iswupper' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:101: error: '::iswxdigit' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:102: error: '::towctrans' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:103: error: '::towlower' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:104: error: '::towupper' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:105: error: '::wctrans' has not been declared /Programs/GCC/Current/lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../include/c++/4.3.0/cwctype:106: error: '::wctype' has not been declared -- /Jonas Karlsson