diff -r 802ab24f67aa -r a389bf17eaaa make/project.xml
--- a/make/project.xml	Tue Dec 23 10:14:13 2025 +0100
+++ b/make/project.xml	Tue Dec 23 14:31:56 2025 +0100
@@ -113,6 +113,11 @@
         <cflags>-DWITH_QSORT_R</cflags>
     </dependency>
 
+    <dependency name="mkstemp">
+        <test>$TOOLCHAIN_CC $CFLAGS $LDFLAGS -o /dev/null make/test_mkstemp.c</test>
+        <cflags>-DWITH_MKSTEMP</cflags>
+    </dependency>
+
     <target>
         <feature name="api-docs">
             <dependencies>doxygen</dependencies>
@@ -152,6 +157,9 @@
         <feature name="memrchr" default="true">
             <dependencies>memrchr</dependencies>
         </feature>
+        <feature name="mkstemp" default="true">
+            <dependencies>mkstemp</dependencies>
+        </feature>
         <feature name="qsort_r" default="true">
             <dependencies>qsort_r</dependencies>
         </feature>