Group headers by standard (POSIX or LSB) or function (internationalization, networking). Move headers standards ignore (but which have been there >15 years) to lib/portability.h. Fold xregcomp into lib since it's posix.
diff --git a/lib/lib.h b/lib/lib.h
index 56927b8..d5b3d3c 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -117,6 +117,7 @@
char *xreadlink(char *name);
long xparsetime(char *arg, long units, long *fraction);
void xpidfile(char *name);
+void xregcomp(regex_t *preg, char *rexec, int cflags);
// lib.c
void verror_msg(char *msg, int err, va_list va);
@@ -178,4 +179,5 @@
void mode_to_string(mode_t mode, char *buf);
void names_to_pid(char **names, int (*callback)(pid_t pid, char *name));
+// Functions in need of further review/cleanup
#include "lib/pending.h"