https://github.com/aide/aide/pull/145
https://bugs.gentoo.org/881707

From 0a7f36406f3f21e4fcdc0c410ff626c352f2d080 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Fri, 18 Nov 2022 00:04:10 +0000
Subject: [PATCH 1/2] Fix bashisms in build system
MIME-Version: 1.0
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configure scripts need to be runnable with a POSIX-compliant /bin/sh.

On many (but not all!) systems, /bin/sh is provided by Bash, so errors
like this aren't spotted. Notably Debian defaults to /bin/sh provided
by dash which doesn't tolerate such bashisms as '=='.

This retains compatibility with bash.

Signed-off-by: Sam James <sam@gentoo.org>
--- a/configure.ac
+++ b/configure.ac
@@ -329,7 +329,7 @@ fi
 AC_CHECK_HEADERS(syslog.h inttypes.h fcntl.h ctype.h)
 
 PCRELIB="-lpcre"
-if test "$aide_static_choice" == "yes"; then
+if test "$aide_static_choice" = "yes"; then
     PCRELIB="$PCRELIB -pthread"
 fi
 AC_CHECK_LIB(pcre, pcre_exec, [
@@ -426,14 +426,14 @@ AS_IF([test "x$with_selinux_support" != xno],
     AC_DEFINE(WITH_SELINUX,1,[use SELinux])
     [AC_MSG_RESULT(yes)
     if test "x$PKG_CONFIG" != xno && $PKG_CONFIG --exists libselinux; then
-        if test "$aide_static_choice" == "yes"; then
+        if test "$aide_static_choice" = "yes"; then
             SELINUXLIB=$(${PKG_CONFIG} --libs libselinux --static)
         else
             SELINUXLIB=$(${PKG_CONFIG} --libs libselinux)
         fi
     else
     SELINUXLIB="-lselinux"
-    if test "$aide_static_choice" == "yes"; then
+    if test "$aide_static_choice" = "yes"; then
         saveLIBS=$LIBS
         LIBS="-static $SELINUXLIB"
         AC_SEARCH_LIBS([lgetfilecon_raw], [], [], [SELINUXLIB="$SELINUXLIB -lpthread"])
@@ -555,7 +555,7 @@ AC_ARG_ENABLE([default_db],
     [do not set default values for database_in and database_out config options]),
     [enable_default_db=$enableval],[enable_default_db=yes])
 
-if test "$enable_default_db" == "yes"; then
+if test "$enable_default_db" = "yes"; then
 
 if test "x$sysconfdir" != x'${prefix}/etc'; then
 	evalled_sysconfdir=`eval echo "$sysconfdir"`
@@ -592,7 +592,7 @@ AC_ARG_WITH([curl],
   [use curl library for http, https and ftp database backend (default: no)]),
  [with_curl=$withval], [with_curl=no])
 AS_IF([test "x$with_curl" = "xyes"], [
-       if test "$aide_static_choice" == "yes"; then
+       if test "$aide_static_choice" = "yes"; then
            PKG_CHECK_MODULES_STATIC(CURL, [libcurl], , [AC_MSG_RESULT([libcurl not found by pkg-config - Try --without-curl or add directory containing libcurl.pc to PKG_CONFIG_PATH environment variable])])
         else
            PKG_CHECK_MODULES(CURL, [libcurl], , [AC_MSG_RESULT([libcurl not found by pkg-config - Try --without-curl or add directory containing libcurl.pc to PKG_CONFIG_PATH environment variable])])
@@ -671,7 +671,7 @@ AS_IF([test "x$with_audit" != xno],
 		AC_MSG_ERROR(You don't have libaudit properly installed. Install it if you need it.)
 	)
 	AUDITLIB="-laudit"
-	if test "$aide_static_choice" == "yes"; then
+	if test "$aide_static_choice" = "yes"; then
 		saveLIBS=$LIBS
 		LIBS="-static $AUDITLIB"
 		AC_CHECK_LIB([audit], [audit_log_user_message], [], [

From 67ad6efc7596c9b3ffdeb411bae942d757e2d96f Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Fri, 18 Nov 2022 00:04:53 +0000
Subject: [PATCH 2/2] Fix configure.ac compatibility with Clang 16

Clang 16 makes -Wimplicit-function-declaration and -Wimplicit-int errors by default.

Unfortunately, this can lead to misconfiguration or miscompilation of software as configure
tests may then return the wrong result.

We also fix -Wstrict-prototypes while here as it's easy to do and it prepares
us for C23.

For more information, see LWN.net [0] or LLVM's Discourse [1], the Gentoo wiki [2],
or the (new) c-std-porting mailing list [3].

[0] https://lwn.net/Articles/913505/
[1] https://discourse.llvm.org/t/configure-script-breakage-with-the-new-werror-implicit-function-declaration/65213
[2] https://wiki.gentoo.org/wiki/Modern_C_porting
[3] hosted at lists.linux.dev.

Signed-off-by: Sam James <sam@gentoo.org>
--- a/configure.ac
+++ b/configure.ac
@@ -295,8 +295,11 @@ AC_CHECK_FUNCS(fcntl ftruncate posix_fadvise asprintf snprintf \
 AC_CACHE_CHECK([for open/O_NOATIME], db_cv_open_o_noatime, [
 echo "test for working open/O_NOATIME" > __o_noatime_file
 AC_TRY_RUN([
-#include <sys/types.h>
 #include <fcntl.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
 #ifndef O_NOATIME
 #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
 #define O_NOATIME 01000000
@@ -304,13 +307,14 @@ AC_TRY_RUN([
 #define O_NOATIME 0
 #endif
 #endif
-main() {
+int main(void) {
 int c, fd = open("__o_noatime_file", O_RDONLY | O_NOATIME, 0);
 exit ((!O_NOATIME) || (fd == -1) || (read(fd, &c, 1) != 1));
 }], [db_cv_open_o_noatime=yes], [db_cv_open_o_noatime=no],
 AC_TRY_LINK([
-#include <sys/types.h>   
 #include <fcntl.h>
+#include <sys/types.h
+#include <sys/stat.h>
 #ifndef O_NOATIME
 #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
 #define O_NOATIME 01000000