--- meson.build.orig	2022-03-18 19:26:47 UTC
+++ meson.build
@@ -1414,11 +1414,42 @@ foreach f : ['strtof', 'mkostemp', 'timespec_get', 'me
 endforeach
 
 foreach f : ['strtof', 'mkostemp', 'timespec_get', 'memfd_create', 'random_r',
-             'flock', 'strtok_r', 'getrandom', 'qsort_r', 'qsort_s']
+             'flock', 'strtok_r', 'getrandom', 'qsort_s']
   if cc.has_function(f)
     pre_args += '-DHAVE_@0@'.format(f.to_upper())
   endif
 endforeach
+
+if cpp.links('''
+    #define _GNU_SOURCE
+    #include <stdlib.h>
+
+    static int dcomp(const void *l, const void *r, void *t) { return 0; }
+
+    int main(int ac, char **av) {
+      int arr[] = { 1 };
+      void *t = NULL;
+      qsort_r((void*)&arr[0], 1, 1, dcomp, t);
+      return (0);
+    }''',
+    args : pre_args,
+    name : 'GNU qsort_r')
+  pre_args += '-DHAVE_GNU_QSORT_R'
+elif cpp.links('''
+    #include <stdlib.h>
+
+    static int dcomp(void *t, const void *l, const void *r) { return 0; }
+
+    int main(int ac, char **av) {
+      int arr[] = { 1 };
+      void *t = NULL;
+      qsort_r((void*)&arr[0], 1, 1, t, dcomp);
+      return (0);
+    }''',
+    args : pre_args,
+    name : 'BSD qsort_r')
+  pre_args += '-DHAVE_BSD_QSORT_R'
+endif
 
 if cc.has_header_symbol('errno.h', 'program_invocation_name',
                         args : '-D_GNU_SOURCE')