build: Fix install of udev rules in VPATH builds

When the build directory is different than the source directory, we
need to specify the source prefix to the original file we are
copying.

diff --git a/Makefile.am b/Makefile.am
index ed13346..31c157c 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -418,7 +418,7 @@ src/ofono.ver: src/ofono.exp
        $(AM_V_at)echo "local: *; };" >> $@
 
 plugins/%.rules:
-       $(AM_V_GEN)cp $(subst 97-,,$@) $@
+       $(AM_V_GEN)cp $(srcdir)/$(subst 97-,,$@) $@
 
 $(src_ofonod_OBJECTS) $(unit_objects): $(local_headers)