Add additional #include directives to prevent implicit function
declarations and build failures with future compilers.
diff --git a/compat/module.ac b/compat/module.ac
index a76cf1c27a4178e6..816025086664b755 100644
--- a/compat/module.ac
+++ b/compat/module.ac
@@ -31,6 +31,8 @@ AC_DEFUN([COMPAT_FUNC_BASENAME], [
[compat_cv_func_basename_works],
[AC_TRY_RUN([
#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
#ifdef HAVE_LIBGEN_H
# include <libgen.h>
#endif
@@ -85,6 +87,8 @@ AC_DEFUN([COMPAT_FUNC_DIRNAME], [
[compat_cv_func_dirname_works],
[AC_TRY_RUN([
#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
#ifdef HAVE_LIBGEN_H
# include <libgen.h>
#endif
@@ -208,6 +212,7 @@ AC_DEFUN([COMPAT_FUNC_MAKEDEV], [
[compat_cv_func_makedev_three_args],
[AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
+#include <stdlib.h>
#include <sys/types.h>
#ifdef MAJOR_IN_MKDEV
# include <sys/mkdev.h>
@@ -248,6 +253,8 @@ AC_DEFUN([COMPAT_FUNC_SNPRINTF], [
[compat_cv_func_snprintf_works],
[AC_TRY_RUN([
#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
typedef struct {
int length;