even more support for weird and sloppy packages

ax_init_standard_project.m4

@@ -372,9 +372,9 @@ EOF
 # fails if not found
 AC_DEFUN([AX_PKG_REQUIRE], [
   PKG_PROG_PKG_CONFIG
-  $1_found=0
+  $1_found=no
   PKG_CHECK_MODULES([$1], [$2], [
-    $1_found=1
+    $1_found=$2
     PKG_REQUIREMENTS+=" $2"
   ], [
     if test -n "$4"; then
@@ -382,7 +382,7 @@ AC_DEFUN([AX_PKG_REQUIRE], [
       for pkg in $4; do
         PKG_CHECK_MODULES([$1], [$pkg], [
           PKG_REQUIREMENTS+=" $pkg"
-          $1_found=1
+          $1_found=$pkg
           break;
         ], [
           AC_MSG_WARN([Recommended package $pkg for feature $1 not installed])
@@ -394,30 +394,48 @@ AC_DEFUN([AX_PKG_REQUIRE], [
   AC_SUBST(AM_CXXFLAGS)
   AC_SUBST(PKG_REQUIREMENTS)
   if test -n "$3"; then
-    $1_found=0
+    tmp_package=${$1_found}
+    $1_found=no
     old_CPPFLAGS=${CPPFLAGS}
     CPPFLAGS=" ${$1_CFLAGS} ${CPPFLAGS}"
     AC_CHECK_HEADER([$3], [
-      $1_found=1
+      $1_found=yes
     ], [
       for x in ${$1_CFLAGS}; do
         AC_MSG_NOTICE([search for $3 in ${x[#]-I}])
         for f in $(find ${x[#]-I} -name "$3"); do
           if test -f "$f"; then
-            $1_found=1
+            $1_found=yes
             $1_CFLAGS+=" -I${f%/*}"
             AC_MSG_NOTICE([added path ${f%/*}])
             break;
           fi
         done
-        if test ${$1_found} -eq 1; then
+        if test "${$1_found}" != "no"; then
           break;
         fi
       done
+      if test "${$1_found}" = "no"; then
+        tmp_includedir=$(pkg-config --variable=includedir $tmp_package)
+        for x in ${tmp_includedir}; do
+          AC_MSG_NOTICE([search for $3 in $x])
+          for f in $(find ${x} -name "$3"); do
+            if test -f "$f"; then
+              $1_found=yes
+              $1_CFLAGS+=" -I${f%/*}"
+              AC_MSG_NOTICE([added path ${f%/*}])
+              break;
+            fi
+          done
+          if test "${$1_found}" != "no"; then
+            break;
+          fi
+        done
+      fi
     ])
     CPPFLAGS=${old_CPPFLAGS}
   fi
-  if test ${$1_found} -eq 0; then
+  if test "${$1_found}" = "no"; then
     if test -n "$3"; then
       if test -n "$4"; then
         AC_MSG_ERROR([Feature $1 not found, need header $3 in modules $2 or $4])