diff --git a/CMakeLists.txt b/CMakeLists.txt
index cd19f39..688d1d9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,6 +13,7 @@ find_package(Gint 2.5 REQUIRED)
 # include directories, put your .h files in those folders
 include_directories(include)
 include_directories(wren/include)
+include_directories("${FXSDK_COMPILER_INSTALL}/include/openlibm")
 
 # source files
 set(SOURCES
@@ -21,7 +22,8 @@ set(SOURCES
   src/ui.c
   src/battery.c
   src/syscalls.S
-
+)
+set(SOURCES_WREN
   wren/src/wren_compiler.c
   wren/src/wren_core.c
   wren/src/wren_debug.c
@@ -32,6 +34,7 @@ set(SOURCES
   wren/src/wren_opt_meta.c
   wren/src/wren_opt_random.c
 )
+
 # shared assets
 set(ASSETS
 	# ...
@@ -77,15 +80,21 @@ set(FLAGS
 	# -O3: gotta go fast
 	-Os
 )
+set(FLAGS_WREN
+  -std=c99
+  -O3
+)
 
-set(ASM_OPTIONS "-x assembler-with-cpp")
-set(CMAKE_ASM_FLAGS "${ASM_OPTIONS}")
+set(CMAKE_ASM_FLAGS "-x assembler-with-cpp")
+
+add_library(Wren ${SOURCES_WREN})
+target_compile_options(Wren PRIVATE ${FLAGS_WREN})
 
 fxconv_declare_assets(${ASSETS} ${ASSETS_fx} ${ASSETS_cg} WITH_METADATA)
-
 add_executable(Main ${SOURCES} ${ASSETS} ${ASSETS_${FXSDK_PLATFORM}})
 target_compile_options(Main PRIVATE ${FLAGS})
-target_link_libraries(Main Gint::Gint)
+
+target_link_libraries(Main Wren Gint::Gint)
 
 if("${FXSDK_PLATFORM_LONG}" STREQUAL fx9860G)
 	generate_g1a(
diff --git a/src/main.c b/src/main.c
index c6ab23e..632c1b5 100644
--- a/src/main.c
+++ b/src/main.c
@@ -15,8 +15,9 @@
 #include "term.h"
 #include "ui.h"
 
-static void wn_write(WrenVM *vm, const char *text) { term_print(text); }
-static void wn_error(WrenVM *vm, WrenErrorType errorType, const char *module, const int line, const char *msg) {
+static void wn_write(WrenVM __attribute__((unused)) * vm, const char *text) { term_print(text); }
+static void wn_error(WrenVM __attribute__((unused)) * vm, WrenErrorType errorType, const char *module, const int line,
+                     const char *msg) {
     switch (errorType) {
     case WREN_ERROR_COMPILE:
         term_printf("[%s line %d] [Error] %s\n", module, line, msg);
@@ -27,10 +28,12 @@ static void wn_error(WrenVM *vm, WrenErrorType errorType, const char *module, co
     case WREN_ERROR_RUNTIME:
         term_eprintf("[Runtime Error] %s\n", msg);
         break;
+    default:
+        break;
     }
 }
 
-static void *wn_reallocate(void *memory, size_t newSize, void *_) {
+static void *wn_reallocate(void *memory, size_t newSize, __attribute__((unused)) void *userData) {
     if (memory == NULL && newSize == 0)
         return NULL;
 
@@ -115,7 +118,7 @@ static void check_keyevents(void) {
     }
 }
 
-int main(int isappli, int optnum) {
+int main(__attribute__((unused)) int isappli, __attribute__((unused)) int optnum) {
     WrenConfiguration config;
     wrenInitConfiguration(&config);
     config.reallocateFn = &wn_reallocate;
@@ -125,9 +128,9 @@ int main(int isappli, int optnum) {
     config.writeFn = &wn_write;
     config.errorFn = &wn_error;
     WrenVM *vm = wrenNewVM(&config);
-    WrenInterpretResult result = wrenInterpret(vm, "my_module",
-                                               "System.print(\"I am running in a VM!\")\n"
-                                               "System.trigger_error_from_vm()");
+    wrenInterpret(vm, "my_module",
+                  "System.print(\"I am running in a VM!\")\n"
+                  "System.trigger_error_from_vm()");
     wrenFreeVM(vm);
 
     timer_redraw = timer_configure(TIMER_ANY, 31250, GINT_CALL(callback_redraw)); // 32 Hz
diff --git a/src/term.c b/src/term.c
index 5abedb7..0b15c1e 100644
--- a/src/term.c
+++ b/src/term.c
@@ -114,7 +114,7 @@ void term_scroll_down(void) {
     }
 }
 
-int term_print_opt(const char *str, int fg, int bg) {
+static int term_print_opt(const char *str, int fg, int bg) {
     static int row = 1;
     static int col = 0;
 
diff --git a/wren/include/wren.h b/wren/include/wren.h
index 7845911..03bd792 100644
--- a/wren/include/wren.h
+++ b/wren/include/wren.h
@@ -299,7 +299,7 @@ typedef enum
 // Get the current wren version number.
 //
 // Can be used to range checks over versions.
-WREN_API int wrenGetVersionNumber();
+WREN_API int wrenGetVersionNumber(void);
 
 // Initializes [configuration] with all of its default values.
 //
diff --git a/wren/src/wren_vm.c b/wren/src/wren_vm.c
index 254d0b0..bb5c277 100644
--- a/wren/src/wren_vm.c
+++ b/wren/src/wren_vm.c
@@ -36,7 +36,7 @@ static void* defaultReallocate(void* ptr, size_t newSize, void* _)
   return realloc(ptr, newSize);
 }
 
-int wrenGetVersionNumber() 
+int wrenGetVersionNumber(void) 
 { 
   return WREN_VERSION_NUMBER;
 }