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-rw-r--r--src/makefile.mingw5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/makefile.mingw b/src/makefile.mingw
index 22dc4801c1..0bde965e1a 100644
--- a/src/makefile.mingw
+++ b/src/makefile.mingw
@@ -30,7 +30,10 @@ CFLAGS=-mthreads -O2 -w -Wall -Wextra -Wformat -Wformat-security -Wno-unused-par
TESTDEFS = -DTEST_DATA_DIR=$(abspath test/data)
-ifdef USE_UPNP
+ifndef USE_UPNP
+ override USE_UPNP = -
+endif
+ifneq (${USE_UPNP}, -)
INCLUDEPATHS += -I"C:\miniupnpc-1.6-mgw"
LIBPATHS += -L"C:\miniupnpc-1.6-mgw"
LIBS += -l miniupnpc -l iphlpapi