Bug: https://bugs.gentoo.org/898106
bsd/string.h is available on most libc's
--- a/palDfltin.c
+++ b/palDfltin.c
@@ -121,6 +121,9 @@ static int ISBLANK( int c ) {
 
 #ifdef HAVE_BSD_STRING_H
 #include <bsd/string.h>
+#else
+#define _GNU_SOURCE
+#define __USE_MISC
 #endif
 
 /* System include files */