Make lite working on FreeBSD

build.sh

@@ -1,22 +1,28 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 cflags="-Wall -O3 -g -std=gnu11 -fno-strict-aliasing -Isrc"
-lflags="-lSDL2 -lm"
+lflags="-lm"
 
 if [[ $* == *windows* ]]; then
   platform="windows"
   outfile="lite.exe"
   compiler="x86_64-w64-mingw32-gcc"
   cflags="$cflags -DLUA_USE_POPEN -Iwinlib/SDL2-2.0.10/x86_64-w64-mingw32/include"
-  lflags="$lflags -Lwinlib/SDL2-2.0.10/x86_64-w64-mingw32/lib"
+  lflags="$lflags -lSDL2 -Lwinlib/SDL2-2.0.10/x86_64-w64-mingw32/lib"
   lflags="-lmingw32 -lSDL2main $lflags -mwindows -o $outfile res.res"
   x86_64-w64-mingw32-windres res.rc -O coff -o res.res
 else
   platform="unix"
   outfile="lite"
-  compiler="gcc"
+  compiler="cc"
   cflags="$cflags -DLUA_USE_POSIX"
   lflags="$lflags -o $outfile"
+  if command -v pkgconf >/dev/null; then
+    cflags="$cflags $(pkgconf --cflags --silence-errors sdl2)"
+    lflags="$lflags $(pkgconf --libs --silence-errors sdl2)"
+  else
+    lflags="$lflags -lSDL2"
+  fi
 fi
 
 if command -v ccache >/dev/null; then

src/main.c

@@ -9,6 +9,9 @@
   #include <unistd.h>
 #elif __APPLE__
   #include <mach-o/dyld.h>
+#elif __FreeBSD__
+  #include <sys/sysctl.h>
+  #include <unistd.h>
 #endif
 
 
@@ -38,6 +41,17 @@ static void get_exe_filename(char *buf, int sz) {
 #elif __APPLE__
   unsigned size = sz;
   _NSGetExecutablePath(buf, &size);
+#elif __FreeBSD__
+  int items[] = {
+    CTL_KERN,
+    KERN_PROC,
+    KERN_PROC_PATHNAME,
+    getpid()
+  };
+
+  size_t len;
+  (void) sysctl(items, 4, buf, &len, NULL, 0);
+  buf[len] = '\0';
 #else
   strcpy(buf, "./lite");
 #endif
@@ -111,7 +125,12 @@ int main(int argc, char **argv) {
   lua_pushnumber(L, get_scale());
   lua_setglobal(L, "SCALE");
 
+#ifdef __FreeBSD__
+  char exename[PATH_MAX];
+#else
   char exename[2048];
+#endif
+
   get_exe_filename(exename, sizeof(exename));
   lua_pushstring(L, exename);
   lua_setglobal(L, "EXEFILE");