diff -r ef7cab6eb131 -r 0db02ab1457c make/project.xml
--- a/make/project.xml	Wed Dec 17 19:05:50 2025 +0100
+++ b/make/project.xml	Wed Dec 17 20:13:08 2025 +0100
@@ -99,15 +99,10 @@
     </dependency>
 
     <dependency name="memrchr">
-        <test>$TOOLCHAIN_CC $CFLAGS -o /dev/null make/test_memrchr.c</test>
+        <test>$TOOLCHAIN_CC $CFLAGS $LDFLAGS -o /dev/null -D_GNU_SOURCE make/test_memrchr.c</test>
         <cflags>-DWITH_MEMRCHR</cflags>
     </dependency>
 
-    <dependency name="memrchr">
-        <test>$TOOLCHAIN_CC $CFLAGS -o /dev/null -D_GNU_SOURCE make/test_memrchr.c</test>
-        <cflags>-DWITH_MEMRCHR -DMEMRCHR_NEED_GNU</cflags>
-    </dependency>
-
     <target>
         <feature name="api-docs">
             <dependencies>doxygen</dependencies>