I've encountered the following problem (introduced by 6326865e): ../../tests/testutils.c: In function 'virtTestRun': ../../tests/testutils.c:289:5: error: implicit declaration of function 'unsetenv' [-Werror=implicit-function-declaration] unsetenv("VIR_TEST_MOCK_TESTNAME"); Apparently, mingw does not have unsetenv(). Therefore we should call it iff we are sure platform we are building for has it. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- This is a tentative patch. Ideally, we would use gnulib's implementation (like we do for setenv()), but there are some licensing problems right now [1]. If they are resolved before our release, we can just pick new gnulib. If, however, they are not, we can just push this patch. 1: https://www.redhat.com/archives/libvir-list/2016-May/msg01952.html tests/testutils.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tests/testutils.c b/tests/testutils.c index f4fbad2..8b7bf70 100644 --- a/tests/testutils.c +++ b/tests/testutils.c @@ -286,7 +286,9 @@ virtTestRun(const char *title, } #endif /* TEST_OOM */ +#ifdef HAVE_UNSETENV unsetenv("VIR_TEST_MOCK_TESTNAME"); +#endif return ret; } -- 2.8.3