diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 71e62c455c..2f249aeb63 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -362,3 +362,40 @@ jobs:
     - name: Execute headless tests
       working-directory: ${{ env.GITHUB_WORKSPACE }}
       run: python test.py -g --graphics=software
+
+  build_test_headless_alpine:
+    runs-on: ubuntu-latest
+    container: 
+      image: alpine:latest
+      options: --shm-size=8g
+    steps:
+    - name: Install Linux dependencies (Alpine)
+      run: |
+        apk add build-base wget git bash cmake python3 glu-dev sdl2-dev
+
+    - uses: actions/checkout@v4
+      with:
+        submodules: recursive
+
+    - name: Fix git detected dubious ownership in repository
+      run: |
+        chown -R $(id -u):$(id -g) $PWD
+
+    - name: Setup ccache
+      uses: hendrikmuhs/ccache-action@v1.2
+    
+    - name: Compile ffmpeg
+      run: |
+        cd ffmpeg && ./linux_x86-64.sh
+
+    - name: Build for testing
+      run: |
+        ./b.sh --headless --unittest
+
+    - name: Execute unit tests
+      run: |
+        ./build/PPSSPPUnitTest ALL
+
+    - name: Execute headless tests
+      run: |
+        python test.py -g --graphics=software
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 93d9ce7ed5..ad2be076bf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -186,6 +186,7 @@ option(USE_SYSTEM_MINIUPNPC "Dynamically link against system miniUPnPc" ${USE_SY
 option(USE_ASAN "Use address sanitizer" OFF)
 option(USE_UBSAN "Use undefined behaviour sanitizer" OFF)
 option(USE_CCACHE "Use ccache if detected" ON)
+option(USE_NO_MMAP "Disable mmap usage" OFF)
 
 if(USE_CCACHE)
 	include(ccache)
@@ -247,6 +248,12 @@ if(HTTPS_NOT_AVAILABLE)
 	add_definitions(-DHTTPS_NOT_AVAILABLE)
 endif()
 
+# Disable the usage of MMAP for the memory system.
+# It is not tested on all platforms and can cause issues.
+if(USE_NO_MMAP)
+	add_definitions(-DNO_MMAP -DMASKED_PSP_MEMORY)
+endif()
+
 # Work around for some misfeature of the current glslang build system
 include_directories(ext/glslang)
 
diff --git a/Common/Data/Collections/FastVec.h b/Common/Data/Collections/FastVec.h
index 673c3ef5db..a8abb5e140 100644
--- a/Common/Data/Collections/FastVec.h
+++ b/Common/Data/Collections/FastVec.h
@@ -7,6 +7,7 @@
 
 #include <cstdlib>
 #include <cstring>
+#include <cstdint>
 
 #include "Common/Log.h"
 
diff --git a/Common/MemArenaPosix.cpp b/Common/MemArenaPosix.cpp
index 6f3c25c900..a413f4eaf2 100644
--- a/Common/MemArenaPosix.cpp
+++ b/Common/MemArenaPosix.cpp
@@ -137,7 +137,7 @@ void MemArena::ReleaseView(s64 offset, void* view, size_t size) {
 
 u8* MemArena::Find4GBBase() {
 	// Now, create views in high memory where there's plenty of space.
-#if PPSSPP_ARCH(64BIT) && !defined(USE_ASAN)
+#if PPSSPP_ARCH(64BIT) && !defined(USE_ASAN) && !defined(NO_MMAP)
 	// We should probably just go look in /proc/self/maps for some free space.
 	// But let's try the anonymous mmap trick, just like on 32-bit, but bigger and
 	// aligned to 4GB for the movk trick. We can ensure that we get an aligned 4GB
diff --git a/b.sh b/b.sh
index e09561ee2b..938a66f85f 100755
--- a/b.sh
+++ b/b.sh
@@ -81,6 +81,9 @@ do
 		--alderlake) echo "Alderlake opt"
 			CMAKE_ARGS="-DCMAKE_C_FLAGS=\"-march=alderlake\" -DCMAKE_CPP_FLAGS=\"-march=alderlake\""
 			;;
+		--no_mmap) echo "Disable mmap"
+			CMAKE_ARGS="-DUSE_NO_MMAP=ON ${CMAKE_ARGS}"
+			;;
 		*) MAKE_OPT="$1 ${MAKE_OPT}"
 			;;
 	esac