bugfix in AX_PKG_REQUIRE

ax_init_standard_project.m4

@@ -442,8 +442,6 @@ AC_DEFUN([AX_PKG_REQUIRE], [
       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)
@@ -457,6 +455,8 @@ AC_DEFUN([AX_PKG_REQUIRE], [
       AC_MSG_ERROR([Required header $3 for feature $1 not found])
     ])
     CPPFLAGS=${old_CPPFLAGS}
+  else
+    AC_MSG_ERROR([Required package $2 for feature $1 not installed])
   fi
 ])