build-sys: disable jobserver for rootfs target

2588e3dff5d broke the distcheck target. Fix it by serializing the rootfs
(re)creation prior to running the testsuite.

diff --git a/Makefile.am b/Makefile.am
index c568265..26f32cd 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -130,7 +130,8 @@ CREATE_ROOTFS = $(AM_V_GEN) ( $(RM) -rf $(ROOTFS) && \
                                touch testsuite/stamp-rootfs && \
                                find $(ROOTFS) -type d -exec chmod +w {} \; )
 
-rootfs:
+# disable jobserver to avoid running in parallel with the testsuite
+-rootfs:
        $(CREATE_ROOTFS)
 .PHONY: rootfs