diff --git a/meson.build b/meson.build
index 7376856..e938537 100644
--- a/meson.build
+++ b/meson.build
@@ -7,6 +7,8 @@ project(
 pkg = import('pkgconfig')
 cc = meson.get_compiler('c')
 
+add_project_arguments('-D_GNU_SOURCE', language: 'c')
+
 # Dependencies
 
 zlib_req = '>=1.2.0'
diff --git a/src/meson.build b/src/meson.build
index a9e80eb..208ba85 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -27,6 +27,8 @@ libfst_dep = declare_dependency(
     include_directories: '.',
 )
 
+meson.override_dependency('libfst', libfst_dep)
+
 install_headers(libfst_headers, subdir: 'libfst')
 
 pkg.generate(