maintcheck: avoid false positive in sc_tests_plain_make

* Makefile.am (sc_tests_plain_make): Ensure to only match full
`make' words.  Avoid false positive in `silent-nested-vars.test'.

diff --git a/Makefile.am b/Makefile.am
index ed01bbb..b2cba62 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -401,7 +401,7 @@ sc_tests_make_without_am_makeflags:
 
 ## Tests should never call make directly.
 sc_tests_plain_make:
-       @if grep -v '^#' $(srcdir)/tests/*.test | grep ':[      ]*make'; then \
+       @if grep -v '^#' $(srcdir)/tests/*.test | $(EGREP) ':[  ]*make( |$$)'; then \
          echo 'Do not run "make" in the above tests.  Use "$$MAKE" instead.' 1>&2; \
          exit 1; \
        fi