diff --git a/Makefile.am b/Makefile.am
index 091bc3f..0f78da1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,5 +1,5 @@
 AUTOMAKE_OPTIONS = foreign subdir-objects -Wall
 bin_PROGRAMS = forge
-forge_SOURCES = src/main.c src/args.c src/forge.c src/file.c
+forge_SOURCES = src/main.c src/args.c src/forge.c src/file.c src/window.c src/shaders.c
 forge_CFLAGS = -Ofast -march=native -flto -funroll-loops -fprefetch-loop-arrays -fno-exceptions -fopenmp
-include_HEADERS = src/main.h src/args.h src/config.h src/types.h src/forge.h src/file.h src/constants.h include/linmath.h include/glad/gl.h
\ No newline at end of file
+include_HEADERS = src/main.h src/args.h src/config.h src/types.h src/forge.h src/file.h src/constants.h src/window.h src/shaders.h include/linmath.h include/glad/gl.h
\ No newline at end of file
diff --git a/src/args.c b/src/args.c
index d7a5ec2..4e7dce4 100644
--- a/src/args.c
+++ b/src/args.c
@@ -27,12 +27,12 @@ void print_help(int status_code) {
 
 void invalid_arg(char *arg) {
   fprintf(stderr, "invalid argument: '%s'\n\n", arg);
-  print_help(1);
+  print_help(EXIT_FAILURE);
 }
 
 void invalid_value(char *arg, char *value) {
   fprintf(stderr, "invalid value for argument '%s': '%s'\n\n", arg, value);
-  print_help(1);
+  print_help(EXIT_FAILURE);
 }
 
 bool is_arg(char *arg, char *ref) { return strcoll(arg, ref) == 0; }
diff --git a/src/shaders.c b/src/shaders.c
new file mode 100644
index 0000000..e69de29
diff --git a/src/shaders.h b/src/shaders.h
new file mode 100644
index 0000000..afbf5ea
--- /dev/null
+++ b/src/shaders.h
@@ -0,0 +1,4 @@
+#ifndef SHADERS_H
+#define SHADERS_H
+
+#endif
\ No newline at end of file
diff --git a/src/window.c b/src/window.c
new file mode 100644
index 0000000..e69de29
diff --git a/src/window.h b/src/window.h
new file mode 100644
index 0000000..46ddc2c
--- /dev/null
+++ b/src/window.h
@@ -0,0 +1,4 @@
+#ifndef WINDOW_H
+#define WINDOW_H
+
+#endif
\ No newline at end of file