--- ./meson.build
+++ ./meson.build
@@ -270,10 +270,16 @@
 config.set('TAISEI_BUILDCONF_HAVE_INT128', cc.sizeof('__int128') == 16)
 config.set('TAISEI_BUILDCONF_HAVE_LONG_DOUBLE', cc.sizeof('long double') > 8)
 config.set('TAISEI_BUILDCONF_HAVE_POSIX', have_posix)
-config.set('TAISEI_BUILDCONF_HAVE_SINCOS', cc.has_function('sincos', dependencies : dep_m))
+# NOTE: macOS exports a sincos symbol from libsystem_m, but never declares it in
+# <math.h> (only __sincos is declared there). A link-only check therefore yields a
+# false positive; probe for a declaration instead.
+have_sincos = cc.has_function('sincos',
+    prefix : '#define _GNU_SOURCE\n#include <math.h>',
+    dependencies : dep_m)
+config.set('TAISEI_BUILDCONF_HAVE_SINCOS', have_sincos)
 
-use_gnu_funcs = false
-gnu_funcs = ['sincos', 'strtok_r', 'memrchr', 'memmem']
+use_gnu_funcs = have_sincos
+gnu_funcs = ['strtok_r', 'memrchr', 'memmem']
 
 foreach f : gnu_funcs
     have = cc.has_function(f, dependencies : dep_m)