diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..4be9fc5
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,23 @@
+name: CI
+on: [push, pull_request]
+jobs:
+  build_and_test:
+    name: Build and test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install GCC multilib
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gcc-multilib g++-multilib
+
+      - name: Build
+        run: make -j
+
+      - name: Test
+        run: |
+          wget https://cdn.discordapp.com/attachments/727918646525165659/917185027656286218/GC_WII_COMPILERS.zip
+          unzip GC_WII_COMPILERS.zip
+          MWCIncludes=. ./wibo GC/2.7/mwcceppc.exe -c test/test.c
+          file test.o
diff --git a/.gitignore b/.gitignore
index cd884b0..db166ac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,5 @@
 wibo
 build/
+*.o
+
+.vscode/
diff --git a/Makefile b/Makefile
index 9cbf0eb..dc25bb9 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 all: wibo
 
-CXXFLAGS = -Wall -g -m32 -std=c++20 -lstdc++ -MD
+CXXFLAGS = -Wall -g -m32 -std=c++2a -lstdc++ -MD
 
 BUILD_DIR := build
 CPP_FILES := $(wildcard *.cpp)
diff --git a/README.md b/README.md
index 79b9710..c4b38a1 100644
--- a/README.md
+++ b/README.md
@@ -1,20 +1,22 @@
 # WiBo
 
-An experiment to try and write a minimal, low-fuss wrapper that can run really simple command-line 32-bit Windows binaries on Linux - with less faff and less dependencies than WINE.
+A minimal, low-fuss wrapper that can run really simple command-line 32-bit Windows binaries on Linux - with less faff and less dependencies than WINE.
 
 Don't run this on any untrusted executables, I implore you. (Or probably just don't run it at all... :p)
 
     make && ./wibo
 
-If you need something like this project (but more mature), you might find [taviso/loadlibrary](https://github.com/taviso/loadlibrary) more interesting.
-
 ---
 
 Rough to-do list:
 
 - Implement more APIs
 - Do something intelligent with Windows `HANDLE`s
-- Pass the command line properly
 - Convert paths in environment variables (and the structure of `PATH` itself, maybe) to Windows format
 - Implement PE relocations rather than just failing unceremoniously
 - Make the PE loader work for DLLs as well in case we ever want to load some
+
+---
+
+Related projects:
+* [taviso/loadlibrary](https://github.com/taviso/loadlibrary)
\ No newline at end of file
diff --git a/main.cpp b/main.cpp
index d6f74f0..6b6528a 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,5 +1,6 @@
 #include "common.h"
 #include <asm/ldt.h>
+#include <filesystem>
 #include <errno.h>
 #include <memory>
 #include <sys/mman.h>
@@ -176,7 +177,14 @@ int main(int argc, char **argv) {
 	wibo::Executable exec;
 	wibo::mainModule = &exec;
 
-	FILE *f = fopen(argv[1], "rb");
+	char* pe_path = argv[1];
+	FILE *f = fopen(pe_path, "rb");
+	if (!f) {
+		std::string mesg = std::string("Failed to open file ") + pe_path;
+		perror(mesg.c_str());
+		return 1;
+	}
+
 	exec.loadPE(f);
 	fclose(f);
 
diff --git a/test/test.c b/test/test.c
new file mode 100644
index 0000000..8cdc6ed
--- /dev/null
+++ b/test/test.c
@@ -0,0 +1,6 @@
+float apple = 3.0f;
+float banana = 65.32f;
+
+int something(void) {
+    return (int)(apple * banana) % 11;
+}