need std=c99 to build tst-regex2

test/misc/Makefile

@@ -6,6 +6,7 @@ TESTS_DISABLED := outb
 include ../Test.mak
 
 CFLAGS_dirent64 := -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
+CFLAGS_tst-regex2 := -std=c99
 
 DODIFF_dirent    := 1
 DODIFF_dirent64  := 1