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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 f4e10367e0..7d73ed27b2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -49,6 +49,8 @@ AC_SEARCH_LIBS([clock_gettime], [rt], [], [AC_MSG_ERROR([*** POSIX RT library no
AC_SEARCH_LIBS([cap_init], [cap], [], [AC_MSG_ERROR([*** POSIX caps library not found])])
AC_CHECK_HEADERS([sys/capability.h], [], [AC_MSG_ERROR([*** POSIX caps headers not found])])
+# This makes sure pkg.m4 is available.
+m4_pattern_forbid([^_?PKG_[A-Z_]+$],[pkg.m4 missing, please install pkg-config])
PKG_CHECK_MODULES(UDEV, [ libudev ])
AC_SUBST(UDEV_CFLAGS)
AC_SUBST(UDEV_LIBS)