CC="$(CC)" CFLAGS="$(CFLAGS)" \
                CC_FOR_BUILD="$(CC_FOR_BUILD)" \
                CC_FOR_TARGET="$(CC_FOR_TARGET)" \
-               CFLAGS_FOR_TARGET="$(CFLAGS_FOR_TARGET) -O0" \
+               CFLAGS_FOR_TARGET="$(filter-out -ffile-prefix-map=%,$(CFLAGS_FOR_TARGET)) -O0" \
                $(RUNTESTFLAGS); \
        else echo "WARNING: could not find \`runtest'" 1>&2; :;\
        fi
 
                CC="$(CC)" CFLAGS="$(CFLAGS)" \
                CC_FOR_BUILD="$(CC_FOR_BUILD)" \
                CC_FOR_TARGET="$(CC_FOR_TARGET)" \
-               CFLAGS_FOR_TARGET="$(CFLAGS_FOR_TARGET) -O0" \
+               CFLAGS_FOR_TARGET="$(filter-out -ffile-prefix-map=%,$(CFLAGS_FOR_TARGET)) -O0" \
                $(RUNTESTFLAGS); \
        else echo "WARNING: could not find \`runtest'" 1>&2; :;\
        fi
 
                CC="$(CC)" CFLAGS="$(CFLAGS)" \
                CXX="$(CXX)" CXXFLAGS="$(CXXFLAGS)" \
                CC_FOR_TARGET="$(CC_FOR_TARGET)" \
-               CFLAGS_FOR_TARGET="$(CFLAGS_FOR_TARGET)" \
+               CFLAGS_FOR_TARGET="$(filter-out -ffile-prefix-map=%,$(CFLAGS_FOR_TARGET))" \
                CXX_FOR_TARGET="$(CXX_FOR_TARGET)" \
-               CXXFLAGS_FOR_TARGET="$(CXXFLAGS_FOR_TARGET)" \
+               CXXFLAGS_FOR_TARGET="$(filter-out -ffile-prefix-map=%,$(CXXFLAGS_FOR_TARGET))" \
                OFILES="$(OFILES)" BFDLIB="$(TESTBFDLIB)" CTFLIB="$(TESTCTFLIB) $(ZLIB)" \
                SFRAMELIB="$(TESTSFRAMELIB)" \
                JANSSON_LIBS="$(JANSSON_LIBS)" ZSTD_LIBS="$(ZSTD_LIBS)" \
 
                CC="$(CC)" CFLAGS="$(CFLAGS)" \
                CXX="$(CXX)" CXXFLAGS="$(CXXFLAGS)" \
                CC_FOR_TARGET="$(CC_FOR_TARGET)" \
-               CFLAGS_FOR_TARGET="$(CFLAGS_FOR_TARGET)" \
+               CFLAGS_FOR_TARGET="$(filter-out -ffile-prefix-map=%,$(CFLAGS_FOR_TARGET))" \
                CXX_FOR_TARGET="$(CXX_FOR_TARGET)" \
-               CXXFLAGS_FOR_TARGET="$(CXXFLAGS_FOR_TARGET)" \
+               CXXFLAGS_FOR_TARGET="$(filter-out -ffile-prefix-map=%,$(CXXFLAGS_FOR_TARGET))" \
                OFILES="$(OFILES)" BFDLIB="$(TESTBFDLIB)" CTFLIB="$(TESTCTFLIB) $(ZLIB)" \
                SFRAMELIB="$(TESTSFRAMELIB)" \
                JANSSON_LIBS="$(JANSSON_LIBS)" ZSTD_LIBS="$(ZSTD_LIBS)" \