On fedora, using the gcc from fedora: gcc (GCC) 4.8.3 20140911 (Red Hat 4.8.3-7) I did an svn update and then moved to my build directory and after make distclean, a ../gcc/configure fails with: make[3]: Entering directory `/usr/local/gccbuild/build-x86_64-unknown-linux-gnu/libcpp' g++ -I../../../gcc/libcpp -I. -I../../../gcc/libcpp/../include -I../../../gcc/libcpp/include -g -O2 -W -Wall -Wno-narrowing -Wwrite-strings -Wmissing-format-attribute -pedantic -Wno-long-long -fno-exceptions -fno-rtti -I../../../gcc/libcpp -I. -I../../../gcc/libcpp/../include -I../../../gcc/libcpp/include -c -o charset.o -MT charset.o -MMD -MP -MF .deps/charset.Tpo ../../../gcc/libcpp/charset.c In file included from ../../../gcc/libcpp/../include/hashtab.h:40:0, from ../../../gcc/libcpp/../include/filenames.h:29, from ../../../gcc/libcpp/system.h:367, from ../../../gcc/libcpp/charset.c:21: ../../../gcc/libcpp/../include/ansidecl.h:171:64: error: new declaration ‘char* basename(const char*)’ # define ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m))) ^ ../../../gcc/libcpp/../include/libiberty.h:113:64: note: in expansion of macro ‘ATTRIBUTE_NONNULL’ extern char *basename (const char *) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_NONNULL(1); ^ In file included from ../../../gcc/libcpp/system.h:201:0, from ../../../gcc/libcpp/charset.c:21: /usr/include/string.h:597:26: error: ambiguates old declaration ‘const char* basename(const char*)’ extern "C++" const char *basename (const char *__filename) Is this a known thing with a quick fix before I look at it? Patrick