diff --git a/.travis/deps.sh b/.travis/deps.sh
index a510c5263..637ab923e 100755
--- a/.travis/deps.sh
+++ b/.travis/deps.sh
@@ -17,6 +17,7 @@ install_arch_linux() {
     sudo pacman -S --noconfirm mesa
     sudo pacman -S --noconfirm libsm
     sudo pacman -S --noconfirm cmake
+    sudo pacman -S --noconfirm sdl2_ttf
 
 }
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 120da3960..e644e3ae4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -82,6 +82,9 @@ endif()
 
 project(simh VERSION "${SIMH_VERSION}" LANGUAGES C CXX)
 
+## Tell cmake we need c99 because GCC 15 defaults to c23 which breaks things.
+set(CMAKE_C_STANDARD 99)
+
 include(vcpkg-setup)
 include(GNUInstallDirs)