Build failed on macOS 15.4, due to "fp.h" not found

KCN-judu · April 12, 2025, 9:54am

Platform info :

Apple Silicon M4
macOS SDK 15.4
Skia-m102
cmake version 4.0.1
ninja version 1.12.1

Build Command:

cmake \
  -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
  -DCMAKE_BUILD_TYPE=RelWithDebInfo \
  -DCMAKE_OSX_ARCHITECTURES=arm64 \
  -DCMAKE_OSX_DEPLOYMENT_TARGET=15.4 \
  -DCMAKE_OSX_SYSROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk \
  -DLAF_BACKEND=skia \
  -DSKIA_DIR=$HOME/deps/skia \
  -DSKIA_LIBRARY_DIR=$HOME/deps/skia/out/Release-arm64 \
  -DSKIA_LIBRARY=$HOME/deps/skia/out/Release-arm64/libskia.a \
  -DPNG_ARM_NEON:STRING=on \
  -G Ninja \
  ..

Error info:

FAILED: third_party/libpng/scripts/intprefix.out /Users/kcn/Downloads/aseprite/build/third_party/libpng/scripts/intprefix.out
cd /Users/kcn/Downloads/aseprite/build/third_party/libpng && /opt/homebrew/bin/cmake -DINPUT=/Users/kcn/Downloads/aseprite/third_party/libpng/scripts/intprefix.c -DOUTPUT=/Users/kcn/Downloads/aseprite/build/third_party/libpng/scripts/intprefix.out -P /Users/kcn/Downloads/aseprite/build/third_party/libpng/scripts/genout.cmake
In file included from /Users/kcn/Downloads/aseprite/third_party/libpng/scripts/intprefix.c:21:
/Users/kcn/Downloads/aseprite/third_party/libpng/scripts/../pngpriv.h:524:16: fatal error: ‘fp.h’ file not found
524 | # include <fp.h>
| ^~~~~~
1 error generated.
CMake Error at scripts/genout.cmake:78 (message):
Failed to generate
/Users/kcn/Downloads/aseprite/build/third_party/libpng/scripts/intprefix.out.tf1

KCN-judu · April 12, 2025, 10:02am

I’ve recently started migrating my development workflow to macOS and am still familiarizing myself with its build toolchain. While troubleshooting a compilation error related to the missing fp.h header, I discovered through external resources that this issue might stem from macOS SDK versions deprecating or excluding fp.h in newer releases.

Given that this file appears to be part of the legacy CarbonCore framework, could you advise on:

Workarounds to resolve the fp.h dependency (e.g., explicit framework linking, header path adjustments).
Project-specific optimizations to modernize the build process and avoid reliance on deprecated components?

Any insights or documentation pointers would be greatly appreciated!

filtom2 · April 13, 2025, 10:16pm

Hello, did you manage to find any fix ? I am at my wits end, tried 3 different tutorials but i always get stuck here at missing fp.h at line 524 any help appreciated. Macbook air m3

filtom2 · April 13, 2025, 10:22pm

I MANAGED TO FIX IT!! I simply changed the line 524 from <fp.h> to <math.h> and it ninja command compiled and produced exectuables in bin.

KCN-judu · April 14, 2025, 10:17am

Thanks for sharing this fix! I’ll try this later.

Dev_TJ · April 19, 2025, 7:56am

Fixed using these steps:

github.com/aseprite/aseprite

Error building aseprite on macos m4 pro

opened 06:47AM - 19 Apr 25 UTC

closed 07:42AM - 19 Apr 25 UTC

Zer0xTJ

OS: MacOS 15.4 (M4 Pro) Hi there, i was trying to build aseprite on mac m4 pro …silicon using the following build command: ``` cmake \ -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \ -DCMAKE_BUILD_TYPE=RelWithDebInfo \ -DCMAKE_OSX_ARCHITECTURES=arm64 \ -DCMAKE_OSX_DEPLOYMENT_TARGET=15.4 \ -DCMAKE_OSX_SYSROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk \ -DLAF_BACKEND=skia \ -DSKIA_DIR=$SKIA \ -DSKIA_LIBRARY_DIR=$SKIA/out/Release-arm64 \ -DSKIA_LIBRARY=$SKIA/out/Release-arm64/libskia.a \ -DPNG_ARM_NEON:STRING=on \ -G Ninja \ .. ``` but im getting the following error: ``` [243/1559] Generating scripts/intprefix.out FAILED: third_party/libpng/scripts/intprefix.out /Users/me/deps/aseprite/build/third_party/libpng/scripts/intprefix.out cd /Users/me/deps/aseprite/build/third_party/libpng && /opt/homebrew/bin/cmake -DINPUT=/Users/me/deps/aseprite/third_party/libpng/scripts/intprefix.c -DOUTPUT=/Users/me/deps/aseprite/build/third_party/libpng/scripts/intprefix.out -P /Users/me/deps/aseprite/build/third_party/libpng/scripts/genout.cmake In file included from /Users/me/deps/aseprite/third_party/libpng/scripts/intprefix.c:21: /Users/me/deps/aseprite/third_party/libpng/scripts/../pngpriv.h:524:16: fatal error: 'fp.h' file not found 524 | # include <fp.h> | ^~~~~~ 1 error generated. CMake Error at scripts/genout.cmake:78 (message): Failed to generate /Users/me/deps/aseprite/build/third_party/libpng/scripts/intprefix.out.tf1 ``` i also tried to change the line 524 to #include <math.h>, still not working. is there any solution ?

bncaswel · April 30, 2026, 9:22pm

@filtom2 , excellent fix man! Worked for me too on another project. you saved my arse!

elizabe · June 9, 2026, 8:20am

Good catch. The fact that replacing fp.h with math.h resolved the issue suggests that the project was relying on a legacy header that is no longer available in newer macOS SDKs. As Apple continues to modernize its toolchain, older Carbon and legacy framework dependencies can cause build failures when compiling on recent macOS versions. For anyone troubleshooting similar compiler and header issues, Apple’s Developer Documentation is often the best place to verify API and SDK changes. I also found this overview of C Programming Concepts useful for understanding standard headers and language fundamentals that frequently come up when porting older codebases. In general, replacing deprecated dependencies with standard library equivalents, where possible, tends to be the most future-proof approach.