====== Compiling potfit using make ======
----

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//**Info:**//
Although potfit still supports using make as a build system it is recommended to use the [[compiling:main|waf]] build system as it fixes several issues present with make.
</wrap>

//potfit// can be compiled with GNU make, which we call gmake in the following. Note that on most systems, GNU make is called make. Most other implementations of make won't work.

<code bash>gmake [FLAGS="some flags"] potfit-target</code>

The compiler and compilation flags are determined according to the ''SYSTEM'' variable, which has to be set once in the Makefile.inc on line 113. 

Further compile or link flags, in addition to those determined by the ''SYSTEM'' variable, can be passed on the command line with the help of the ''FLAGS'' environment variable.

After compiling, the potfit executable is moved to the directory ''$HOME/bin'', if it exists. Otherwise it is not moved. The location where executables are put can also be customized in src/Makefile (line 40, BIN_DIR variable).

''potfit-target'' consists of several components and has the following structure:

   potfit[_parallelization][_option][_option]...

Most features of potfit must be activated with the corresponding compilation option in the make target. The most important option is the interaction you want to use. Most options can coexist with each other.

Here are some [[compiling:make_examples|examples]] that might help you compile //potfit//.

===  Compilation Options  ===

The compilation options are described together with the simulation features they enable. For details, see the [[options:main]]. 

===  Supported values of the ''SYSTEM'' variable  ===

Currently, the following values of the ''SYSTEM'' variable are supported and properly tested:

<code>
x86_64-gcc 	All recent 64 bit processors, gcc
x86_64-clang 	All recent 64 bit processors, clang
x86_64-icc 	All recent 64 bit processors, icc
</code>

The following values of the ''SYSTEM'' variable are also available but not very well tested:

<code>
i686-gcc 	32 bit processor, gcc
i686-icc 	32 bit processor, icc
</code>

Support for different values of ''SYSTEM'' is easily added. The Makefile contains a detailed decsription of how the compile and link flags are determined from a number of Makefile variables, which has to be set for each supported value of ''SYSTEM''. There is a template from which one can start.

===  Problems with the Intel Math Kernel Library  ===

If you are having trouble linking //potfit// with the Intel MKL, please take a look at the [[http://software.intel.com/en-us/articles/intel-mkl-link-line-advisor/|MKL Link Line Advisor]]. Replace the ''LIBS'' variable in your profile by the output of the advisor.