Rephrase comment before PKG_CHECK_EXISTS in pkg.m4

diff --git a/pkg.m4 b/pkg.m4
index 6bfe45ce7132387aab77a4282ae7e0f0ecda06f4..95f7cbcfa56f0593c477806081b9373493d9b0ed 100644 (file)
--- a/pkg.m4
+++ b/pkg.m4
@@ -51,10 +51,10 @@ fi[]dnl
 # Check to see whether a particular set of modules exists.  Similar
 # to PKG_CHECK_MODULES(), but does not set variables or print errors.
 #
-#
-# Similar to PKG_CHECK_MODULES, make sure that the first instance of
-# this or PKG_CHECK_MODULES is called, or make sure to call
-# PKG_CHECK_EXISTS manually
+# Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
+# only at the first occurence in configure.ac, so if the first place
+# it's called might be skipped (such as if it is within an "if", you
+# have to call PKG_CHECK_EXISTS manually
 # --------------------------------------------------------------
 AC_DEFUN([PKG_CHECK_EXISTS],
 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl