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https://bugs.gentoo.org/978866#c8
Thanks to Bernd Feige.
--- a/ac/gtest.m4
+++ b/ac/gtest.m4
@@ -35,5 +35,23 @@ AC_DEFUN([AX_GTEST],[
AC_SUBST(GTEST_TYPE)
])
-AX_GTEST
+AC_ARG_ENABLE(
+ [tests],
+ AS_HELP_STRING([--disable-tests],[Disable building of unit tests (default: auto)]),
+ [],
+ [enable_tests=auto]
+)
+
+if test x"$enable_tests" != xno; then
+ AX_GTEST
+else
+ GTEST_CFLAGS=
+ GTEST_LIBS=
+ GTEST_TYPE=no
+ AC_SUBST([GTEST_CFLAGS])
+ AC_SUBST([GTEST_LIBS])
+ AC_SUBST([GTEST_TYPE])
+ AC_MSG_NOTICE([Tests disabled; not looking for gtest])
+fi
+
AC_PATH_PROG(VALGRIND, valgrind,, $PATH)
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