check for and use freetype2

wscript

@@ -9,6 +9,7 @@ def configure(conf):
     conf.load("compiler_c compiler_cxx")
     conf.check(header_name = "getopt.h")
     conf.check_cfg(package = "sdl2", args = "--cflags --libs")
+    conf.check_cfg(package = "freetype2", args = "--cflags --libs")
 
 def build(bld):
     includes = [p for p in bld.path.ant_glob("src/**", dir = True) if os.path.isdir(p.abspath())]
@@ -20,7 +21,7 @@ def build(bld):
         defines = ['GLCXX_GL_INCLUDE="gl3w.h"'],
         cxxflags = ["-Wall", "-std=gnu++14"],
         lib = ["dl", "GL"],
-        uselib = "SDL2")
+        uselib = ["SDL2", "FREETYPE2"])
 
     test_libs = []
     if re.search(r'linux', platform.platform(), re.IGNORECASE):