--- git-compat-util.h_orig	2023-04-21 01:21:15.526980822 +0000
+++ git-compat-util.h	2023-04-21 01:24:02.176280678 +0000
@@ -356,13 +356,15 @@
 #define setitimer(which,value,ovalue) git_setitimer(which,value,ovalue)
 #endif
 
+#ifdef _AIX51
+#define NO_LIBGEN_H
+#endif
+
 #ifndef NO_LIBGEN_H
 #include <libgen.h>
 #else
-#define basename gitbasename
-char *gitbasename(char *);
-#define dirname gitdirname
-char *gitdirname(char *);
+char *basename(char *);
+char *dirname(char *);
 #endif
 
 #ifndef NO_ICONV