--- include/libxml/xmlversion.h.in.orig 2004-09-13 16:42:41.000000000 -0700 +++ include/libxml/xmlversion.h.in 2004-09-13 16:43:18.000000000 -0700 @@ -84,7 +84,7 @@ * Whether the thread support is configured in */ #if @WITH_THREADS@ -#if defined(_REENTRANT) || defined(__MT__) || (_POSIX_C_SOURCE - 0 >= 199506L) +#if defined(_REENTRANT) || defined(__MT__) || (defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0 >= 199506L)) #define LIBXML_THREAD_ENABLED #endif #endif