Blank Interface

[silverhammermba]

On Linux, the interface isn't being drawn. It only draws if I interact with it (by moving a slider, for example) which is difficult because I can't see it otherwise.

Here's how I'm building it

CXXFLAGS=-std=c++11 -I/usr/include/jsoncpp `wx-config --version=2.9 --cxxflags`
SOURCE=$(wildcard *.cpp)
TARGET=sandbox

$(TARGET): $(patsubst %.cpp,%.o,$(SOURCE))
        $(CXX) $(CXXFLAGS) -o sandbox $+ -ljsoncpp -lGL `wx-config --version=2.9 --libs --gl-libs`