diff --git a/configure.ac b/configure.ac
index eecca62600b8bcdc585a840fabbdff4c6ca6ae37..8f7a4f33e16d985631a54bb7cc0750c34bc3cbc4 100644 (file)
--- a/configure.ac
+++ b/configure.ac
AC_PROG_LIBTOOL
AC_PROG_LEX
AC_PROG_YACC
+
+# Warn when pkg.m4 is missing
+m4_pattern_forbid([^_?PKG_[A-Z_]+$],[*** pkg.m4 missing, please install pkg-config])
+
PKG_PROG_PKG_CONFIG
AC_CHECK_PROG([have_protoc_c], [protoc-c], [yes], [no])