diff --git a/wscript b/wscript
index 73107c2..142a301 100644
--- a/wscript
+++ b/wscript
@@ -3,12 +3,13 @@ import sys
 APP_NAME = "cxlc"
 
 def options(opt):
-    opt.load("compiler_c compiler_cxx");
+    opt.load("compiler_c compiler_cxx flex bison");
 
 def configure(conf):
     conf.load("compiler_c compiler_cxx flex bison");
 
 def build(bld):
+    bld.load("compiler_c compiler_cxx flex bison");
     sources = bld.path.ant_glob("src/**/*.c")
     sources += bld.path.ant_glob("src/**/*.cc")
     lexer_source = "src/parser/parser.l"
@@ -17,6 +18,7 @@ def build(bld):
     includes = ["src", "src/parser"]
     cflags = ["-Wall", "-O2"]
     cxxflags = cflags
+    bld.env.BISONFLAGS += ["-v"]
     bld.program(
             features = ['c', 'cxx', 'cxxprogram'],
             source = sources,