https://github.com/termux/termux-packages/issues/15852

--- a/auto/unix
+++ b/auto/unix
@@ -164,7 +164,7 @@
     ngx_feature="crypt() in libcrypt"
     ngx_feature_name=
     ngx_feature_run=no
-    ngx_feature_incs=
+    ngx_feature_incs="#include <crypt.h>"
     ngx_feature_path=
     ngx_feature_libs=-lcrypt
     . auto/feature