/usr/include/regexp.h contains a reference to __alloca, but that is only available in the internal version of include/alloca.h and not in stdlib/alloca.h of the current glibc sources. Probably regexp.h should be changed to use alloca() instead of __alloca(). Sorry for not using glibcbug, but I don't have a running glibc-system. Thanks for glibc, Florian La Roche