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When building with clang-16, the following build error is raised.

clang -c -O2 -march=x86-64 -pipe -pipe -frecord-gcc-switches -fno-diagnostics-color -fmessage-length=0  -g  -Wall -Wextra -Wno-unused-function -std=c99 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=500 src/util.c -osrc/util.o
src/util.c:13:9: error: call to undeclared function 'vsyslog'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
        vsyslog(level, fmt, args);
src/util.c:13:9: note: did you mean 'syslog'?
/usr/include/syslog.h:62:6: note: 'syslog' declared here
void syslog (int, const char *, ...);

This is due to vsyslog being available when _GNU_SOURCE or _BSD_SOURCE
is defined [1]. This patch does that, thus fixing the error.


Signed-off-by: Brahmajit Das <>

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August 3, 2023 23:41
January 18, 2019 11:55
February 7, 2016 13:44


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This is an enhanced version of Allan McRae mbpfan

mbpfan is a daemon that uses input from coretemp module and sets the fan speed using the applesmc module. This enhanced version assumes any number of processors and fans (max. 10).

  • It only uses the temperatures from the processors as input.
  • It requires coretemp and applesmc kernel modules to be loaded.
  • It requires root use
  • It daemonizes or stays in foreground
  • Verbose mode for both syslog and stdout
  • Users can configure it using the file /etc/mbpfan.conf

Table Of Contents

Supported GNU/Linux Distributions

We provide scripts to to load mbpfan daemon at system boot for many distros. Please note that the support is provided by volunteers. mbpfan needs tests and bug reports.

Supported distributions:

  • Ubuntu
  • Debian
  • Archlinux
  • Fedora
  • RedHat
  • CentOS
  • Gentoo
  • Alpine
  • Trisquel
  • Solus

Tested Mac Models

See .


Be sure to load the kernel modules applesmc and coretemp.

These modules are often automatically loaded when booting up GNU/Linux on a MacBook. If that is not the case, you should make sure to load them at system startup.

How do I know if applesmc and coretemp are loaded?

In most distributions, you can run the following command:

lsmod | grep -e applesmc -e coretemp

If you see coretemp and applesmc listed, you are all set.

If you do not see coretemp and applesmc listed, you must load them.

This is usually achieved by inserting the following two lines in the file /etc/modules


Please check the relevant documentation of your GNU/Linux distribution.


Arch Linux

See mbpfan-git at AUR. Otherwise, please refer to the Generic Instructions.

CRUX Linux

Follow the instructions on jolupalabs REPO for installation.


On Debian 10 or later install via:

sudo apt-get install mbpfan


On Fedora 30 or later:

sudo dnf install mbpfan


Install the mbpfan package with:

sudo emerge -av app-laptop/mbpfan


On Solus, install the package with:

sudo eopkg install mbpfan

then enable the service.


On Ubuntu 18.04 or later install via:

sudo apt-get install mbpfan

Generic Install Instructions (All Other Operating Systems)

Compile with


Install with

sudo make install

It copies mbpfan to /usr/sbin, mbpfan.conf to /etc (and overwrites existing files), to /usr/share/doc/mbpfan, and mbpfan.8.gz to /usr/share/man/man8

If you would like to compile with Clang instead of GCC, simply set your system's default compiler to be Clang. Tested with Clang 3.8 and 3.9. Tested with Clang 4.0 along with llvm-lld (The LLVM Linker).

Run The Tests (Optional)

Users may run the tests after building the program. Please run the following command from within the source directory.

sudo make tests

Note that this only works on MacBook and not desktop computers due to different environment expectations.

Run Instructions

If not installed, run with

sudo bin/mbpfan

If installed, manually run with

sudo mbpfan

If installed and using the init file, run with (Ubuntu example)

sudo service mbpfan start

Starting at boot


For systemd based init systems (Ubuntu 16.04+), see the systemd section below.

For upstart based init systems (Ubuntu before 16.04), an example upstart job has been provided. For using it, execute:

sudo cp mbpfan.upstart /etc/init/mbpfan.conf
sudo start mbpfan

Debian An init file suitable for /lib/lsb/init-functions (Debian) is located in the main folder of the source files, called mbpfan.init.debian Rename it to mbpfan, give it execution permissions (chmod +x mbpfan) and move it to /etc/init.d Then, add it to the default runlevels with (as root):

sudo update-rc.d mbpfan defaults

Redhat, CentOS, Fedora An init file suitable for /etc/rc.d/init.d/functions (RHEL/CentOS & Fedora) is also located at the same place, this file is called mbpfan.init.redhat. Also rename it to mbpfan, give it execution permissions and move it to /etc/init.d To add the script to the default runlevels, run the following as root:

chkconfig --level 2345 mbpfan on && chkconfig --level 016 mbpfan off


To automatically run mbpfan at boot, run as root:

rc-update add mbpfan default

systemd As a special bonus, a service file for systemd is also included. To use it, execute the following (as root):

sudo cp mbpfan.service /etc/systemd/system/
sudo systemctl enable mbpfan.service
sudo systemctl daemon-reload
sudo systemctl start mbpfan.service

dinit A dinit service definition is also included. To use it, execute the following:

sudo cp mbpfan.dinit /etc/dinit.d/mbpfan
sudo dinitctl enable mbpfan
sudo dinitctl start mbpfan


Usage: ./mbpfan OPTION(S)

-h Show the help screen
-f Run in foreground
-v Be (a lot) verbose



GNU General Public License version 3


This Project Is Based On:

This Project uses following library:


A simple daemon to control fan speed on all MacBook/MacBook Pros (probably all Apple computers) for Linux Kernel 3 and newer








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