The Bug http://ufoai.org/bugs/ufoalieninvasion/issues/5335 which is fixed in the master repository also appears in the stable version.

<source lang="">
===> CXX [game] src/game/g_ai.cpp
src/game/g_ai.cpp:1111:22: error: call to 'abs' is ambiguous
const int distX = std::abs(ent->pos[0] - to[0]);
^~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/cmath:660:1: note:
candidate function
abs(float __x) _NOEXCEPT {return fabsf(__x);}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/cmath:664:1: note:
candidate function
abs(double __x) _NOEXCEPT {return fabs(__x);}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/cmath:668:1: note:
candidate function
abs(long double __x) _NOEXCEPT {return fabsl(__x);}
^
src/game/g_ai.cpp:1112:22: error: call to 'abs' is ambiguous
const int distY = std::abs(ent->pos[1] - to[1]);
^~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/cmath:660:1: note:
candidate function
abs(float __x) _NOEXCEPT {return fabsf(__x);}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/cmath:664:1: note:
candidate function
abs(double __x) _NOEXCEPT {return fabs(__x);}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/cmath:668:1: note:
candidate function
abs(long double __x) _NOEXCEPT {return fabsl(__x);}
^
</source>

It seems someone needs to backport the bugfix from the master branch.
This report is related to this thread in the forum: http://ufoai.org/forum/index.php/topic,8748.0.html