So far I am using precompiled binaries. They work. Now I am thinking on 
writing my own branch/contributing to sage so I followed the instructions on

http://doc.sagemath.org/html/en/developer/walk_through.html

to get a developer version of sage.
Basically I just typed

git clone git://github.com/sagemath/sage.git
cd sage
git checkout develop
make

And get an error Message:
[singular-3.1.7p1.p2] checking size of long... (cached) 0
[singular-3.1.7p1.p2] checking size of void*... 8
[singular-3.1.7p1.p2] checking size of double... 8
[singular-3.1.7p1.p2] checking size of size_t... 8
[singular-3.1.7p1.p2] configure: error: need equal sizes for long and void*
[singular-3.1.7p1.p2] configure: error: ./configure failed for omalloc
[singular-3.1.7p1.p2] Unable to configure Singular.
[singular-3.1.7p1.p2] Error building Singular (error in config).

(the log is too big to attach)
What went wrong?

So here are the system details:



Linux 4.6.7-300.fc24.x86_64 #1 SMP Wed Aug 17 18:48:43 UTC 2016 x86_64 
x86_64 x86_64 GNU/Linux

LSB Version:    
:core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
Distributor ID:    Fedora
Description:    Fedora release 24 (Twenty Four)
Release:    24
Codename:    TwentyFour

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