diff -Nur zchunk-1.1.9/meson.build new/meson.build
--- zchunk-1.1.9/meson.build	2020-12-30 23:47:08.000000000 +0100
+++ new/meson.build	2021-04-27 00:18:38.152514197 +0200
@@ -28,7 +28,7 @@
 
 curl_dep = dependency('libcurl')
 
-if build_machine.system() == 'darwin' or build_machine.system() == 'freebsd' or not cc.links('#include <argp.h>\nstatic error_t parse_opt (int key, char *arg, struct argp_state *state) { argp_usage(state); }; void main() {}')
+if build_machine.system() == 'darwin' or build_machine.system() == 'freebsd' or not cc.links('#include <argp.h>\nstatic error_t parse_opt (int key, char *arg, struct argp_state *state) { argp_usage(state); return 0; }; void main() {}')
     argplib = cc.find_library('argp')
 else
     argplib = dependency('', required : false)