add workaround for musl

src/abaddon.cpp

@@ -1,4 +1,5 @@
 #include "abaddon.hpp"
+#include <cstdlib>
 #include <memory>
 #include <spdlog/spdlog.h>
 #include <spdlog/cfg/env.h>
@@ -1153,7 +1154,32 @@ void Abaddon::on_window_hide() {
     }
 }
 
+// clang-format off
+
+#ifdef __GLIBC__
+    #ifndef _GNU_SOURCE
+        #define _GNU_SOURCE
+        #include <features.h>
+        #ifndef __USE_GNU
+            #define __MUSL__
+        #endif
+        #undef _GNU_SOURCE
+    #else
+        #include <features.h>
+        #ifndef __USE_GNU
+            #define __MUSL__
+        #endif
+    #endif
+#endif
+
+// clang-format on
+
 int main(int argc, char **argv) {
+#ifdef __MUSL__
+    char env[] = "LANG=C";
+    putenv(env);
+#endif
+
     if (std::getenv("ABADDON_NO_FC") == nullptr)
         Platform::SetupFonts();