improved check for required packages

ax_init_standard_project.m4

@@ -242,7 +242,7 @@ EOF
 # use this in configure.ac to support C++ libraries
 AC_DEFUN([AX_USE_LIBTOOL], [
   # libtool versioning
-  LIB_MAJOR=m4_eval(x_major+x_minor)
+  LIB_MAJOR=m4_eval(x_major+x_minor_fixed)
   LIB_MINOR=x_least
   LIB_LEAST=x_minor_fixed
   LIB_VERSION="${LIB_MAJOR}:${LIB_MINOR}:${LIB_LEAST}"
@@ -381,11 +381,14 @@ AC_DEFUN([AX_PKG_REQUIRE], [
           break
         fi
       done
-      if test ${$1_found} -eq 0; then
-        for p in /usr/include ${$1_CFLAGS}; do
-          $1_file=$(find ${p#-I} -name $3)
+      if test ${$1_found} -eq 0 -a -n "$3"; then
+        for p in "/usr/include" ${$1_CFLAGS}; do
+          AC_MSG_NOTICE([checking: [${p}] with [${p#-I}]])
+          $1_file=$(find ${p#-I} -name $(echo "$3" | sed 's,.*/,,') | grep "$3" | head -1)
+          AC_MSG_NOTICE([call: $1_file=[\$](find [$]{p[#]-I} -name "$3")])
+          AC_MSG_NOTICE([found: ${$1_file}])
           if test -e "${$1_file}"; then
-            AC_MSG_NOTICE([Header file $3 found in sub path as ${$1_file}])
+            AC_MSG_NOTICE([Header file $3 found in sub path of $2 as ${$1_file}])
             $1_CFLAGS="${$1_CFLAGS} -I${$1_file%/$3}"
             $1_found=1
             break
@@ -393,7 +396,7 @@ AC_DEFUN([AX_PKG_REQUIRE], [
         done
       fi
       if test ${$1_found} -eq 0; then
-        AC_MSG_WARN([Header file $3 not found in $1_CFLAGS = ${$1_CFLAGS}])
+        AC_MSG_ERROR([Header file $3 not found in $2 with $1_CFLAGS = ${$1_CFLAGS}])
       fi
     fi
     AM_CPPFLAGS+=" ${$1_CFLAGS}"
@@ -401,8 +404,8 @@ AC_DEFUN([AX_PKG_REQUIRE], [
     LIBS+=" ${$1_LIBS}"
     PKG_REQUIREMENTS+=" $2"
   ], [
-    AC_MSG_WARN([Recommended package $2 for feature $1 not installed])
     if test -n "$4"; then
+      AC_MSG_WARN([Recommended package $2 for feature $1 not installed, trying $4])
       for pkg in $4; do
         PKG_CHECK_MODULES([$1], [$pkg], [
           if test -n "$3"; then
@@ -415,9 +418,9 @@ AC_DEFUN([AX_PKG_REQUIRE], [
             done
             if test ${$1_found} -eq 0; then
               for p in /usr/include ${$1_CFLAGS}; do
-                $1_file=$(find ${p#-I} -name $3)
+                $1_file=$(find ${p#-I} -name $(echo "$3" | sed 's,.*/,,') | grep "$3" | head -1)
                 if test -e ${$1_file}; then
-		  AC_MSG_NOTICE([Header file $3 found in sub path as ${$1_file}])
+		  AC_MSG_NOTICE([Header file $3 found in sub path of ${pkg} as ${$1_file}])
                   $1_CFLAGS="${$1_CFLAGS} -I${$1_file%/$3}"
                   $1_found=1
                   break
@@ -425,7 +428,7 @@ AC_DEFUN([AX_PKG_REQUIRE], [
               done
             fi
             if test ${$1_found} -eq 0; then
-              AC_MSG_WARN([Header file $3 not found in $1_CFLAGS = ${$1_CFLAGS}])
+              AC_MSG_WARN([Header file $3 not found in ${pkg} with $1_CFLAGS = ${$1_CFLAGS}])
             fi
           fi
           AM_CPPFLAGS+=" ${$1_CFLAGS}"
@@ -436,6 +439,11 @@ AC_DEFUN([AX_PKG_REQUIRE], [
           AC_MSG_WARN([Recommended package $pkg for feature $1 not installed])
         ])
       done
+      if test ${$1_found} -eq 0; then
+        AC_MSG_ERROR([Required package $2 or $4 for feature $1 not installed])
+      fi
+    else
+      AC_MSG_ERROR([Required package $2 for feature $1 not installed])
     fi
   ])
   AC_SUBST(AM_CPPFLAGS)