diff --git a/src/makefile b/src/makefile
index 2f8c292..eab2d30 100644
--- a/src/makefile
+++ b/src/makefile
@@ -34,10 +34,10 @@ sources := $(wildcard *.cpp)
 objects := $(addprefix $(OBJDIR)/,$(sources:.cpp=.o))
 depends := $(addprefix $(OBJDIR)/,$(sources:.cpp=.d))
 
-CXXFLAGS := $$(wx-config --cxxflags) -std=c++14 $(CXXFLAGS) $(addprefix -I, $(IDIRS))
-CPPFLAGS := $$(wx-config --cppflags) $(CPPFLAGS)
+CXXFLAGS := $(shell wx-config --cxxflags) -std=c++14 $(CXXFLAGS) $(addprefix -I, $(IDIRS))
+CPPFLAGS := $(shell wx-config --cppflags) $(CPPFLAGS)
 LDFLAGS  += $(addprefix -L, $(LDDIRS))
-LDLIBS   += $$(wx-config --libs)
+LDLIBS   += $(shell wx-config --libs)
 
 ifeq ($(UNAME), Linux)
    LDLIBS += -lboost_thread -lboost_regex -lboost_filesystem -lboost_system