configure: Require NPM to build the frontend

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

diff --git a/configure.ac b/configure.ac
index a00830ec95bfc763fb13a530c09b75383a48f438..abdf1bc9c63e5ef0306de17f4cadb153c279a215 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -58,6 +58,12 @@ AM_PATH_PYTHON([3.4])
 
 AX_PYTHON_MODULE([PAM], [fatal])
 
+# npm
+AC_CHECK_PROG(NPM, npm, yes, no)
+if test "x$NPM" = "xno"; then
+       AC_MSG_ERROR([npm is required to build the frontend])
+fi
+
 # SASSC
 AC_CHECK_PROG(SASSC, [sassc], [sassc])
 if test -z "${SASSC}"; then