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-rw-r--r--configure.ac2
1 files changed, 2 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 8be3147..ee67217 100644
--- a/configure.ac
+++ b/configure.ac
@@ -42,6 +42,8 @@ AC_SUBST(LT_CURRENT)
AC_SUBST(LT_REVISION)
AC_SUBST(LT_AGE)
+m4_ifndef([PKG_PROG_PKG_CONFIG],
+ [pkg.m4 version 0.28 or later is required])
AC_PROG_CC
AC_ISC_POSIX