diff --git a/external/glslang/SPIRV/SpvBuilder.h b/external/glslang/SPIRV/SpvBuilder.h
index 02e9cf40..f5d9c2c6 100644
--- a/external/glslang/SPIRV/SpvBuilder.h
+++ b/external/glslang/SPIRV/SpvBuilder.h
@@ -61,6 +61,7 @@ namespace spv {
 #include <set>
 #include <sstream>
 #include <stack>
+#include <cstdint>
 #include <unordered_map>
 #include <map>

diff --git a/unix/Makefile.in b/unix/Makefile.in
index a87cd079..7c78a0a5 100644
--- a/unix/Makefile.in
+++ b/unix/Makefile.in
@@ -37,7 +37,7 @@ GASM       = @CXX@
 INCLUDES   += -I. -I.. -I../apu/ -I../apu/bapu -I../jma/ -I../filter/

 CCFLAGS    = @S9XFLGS@ @S9XDEFS@ $(DEFS)
-CFLAGS     = $(CCFLAGS)
+CFLAGS     += $(CCFLAGS)

 .SUFFIXES: .o .cpp .c .cc .h .m .i .s .obj
 
diff --git a/gtk/CMakeLists.txt b/gtk/CMakeLists.txt
index 6d13d493..ef56eea2 100644
--- a/gtk/CMakeLists.txt
+++ b/gtk/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.18)
+cmake_minimum_required(VERSION 4.0)
 project(snes9x-gtk VERSION 1.63)

 option(USE_SLANG "Build support for Vulkan output and .slangp shaders" ON)