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+EasyBuild Support for System Compilers
+======================================
+
+
+Motivation
+----------
+
+Beyond the default usage scenario of EasyBuild where it is used to
+build and install the complete software stack for HPC cluster system,
+there is another scenario in which EasyBuild is very useful: people want to
+easily install a complex software package or set of packages on their laptop or
+workstation. In that case, users are typically annoyed by the fact that
+EasyBuild requires them to re-install yet another version of a compiler
+instead of allowing them to re-use already existing compilers (either done
+manually by the user or by using the compiler(s) provided by the Linux
+distribution). This is the scenario supported by the EasyBlock
+"SystemCompiler".
+
+
+Currently Supported Compilers
+-----------------------------
+
+GCC, icc, ifort
+
+
+Basic Usage
+-----------
+
+The most simple case, where a user just wants to use the compiler
+provided by the Linux distribution (compiler is in $PATH), the following
+EasyConfig can be used:
+
+----- GCC-system.eb ------------------------------------------------------
+easyblock = 'SystemCompiler'
+name = 'GCC'
+version = 'system'
+
+homepage = ""
+description = ""
+toolchain = {'name': 'dummy', 'version': 'dummy'}
+
+moduleclass = 'compiler'
+--------------------------------------------------------------------------
+
+The EasyConfig parameters "homepage", "description", and "toolchain" are
+technically not necessary but are currently required by EasyBuild and
+should be provided as shown in the example. The "moduleclass" parameter
+is technically optional, but should also be set like shown above to ensure
+correct handling of the compiler inside EasyBuild.
+
+The values for "homepage" and "description" are corrected to the right values
+automatically by the SystemCompiler EasyBlock. 
+
+The compiler the user wants to make available to EasyBuild is specified in the
+parameter "name". Currently, only the values "GCC", "icc", or "ifort" are
+recognized and supported. If the "version" parameter is set to 'system',
+the SystemCompiler EasyBlock automatically derives the correct version number
+from the system compiler and sets internal variables accordingly.
+
+The command "eb GCC-system.eb" analog to the EasyBuild command to build and
+install a compiler does the necessary bookkeeping and module generation for
+the desired system compiler. It can then be used to install the rest of the
+necessary toolchain and desired packages.
+
+
+Advanced Usage
+--------------
+
+Advanced users might have multiple versions of compilers already installed on
+their system and want to make them all available to EasyBuild. In that case,
+EasyConfigs like the following can be used:
+
+----- GCC-4.8.3-system.eb ------------------------------------------------
+easyblock = 'SystemCompiler'
+name = 'GCC'
+version = '4.8.3'
+versionsuffix = '-system'
+
+homepage = ""
+description = ""
+toolchain = {'name': 'dummy', 'version': 'dummy'}
+
+moduleclass = 'compiler'
+--------------------------------------------------------------------------
+
+Before making this compiler version available to EasyBuyild (via "eb
+GCC-4.8.3-system.eb") the user needs to ensure that the correct compiler
+version is found on $PATH (either by setting $PATH correctly or by using a
+self-installed module). The SystemCompiler EasyBlock does basically the same
+things as described under "Basic Usage" with the only difference that after
+automatically deriving the compiler version, it is checked whether it matches
+the version specified in the parameter "version", and if it does not, an error
+is printed and the installation is not performed.
+
+If the different versions of compiler on the system are made available through
+system modules, they should also be specified like in the following example
+(where it is assumed the system compiler is provided by the system module
+"GNU/4.8.3"):
+
+----- GCC-4.8.3-system.eb ------------------------------------------------
+easyblock = 'SystemCompiler'
+name = 'GCC'
+version = '4.8.3'
+versionsuffix = '-system'
+
+homepage = ""
+description = ""
+toolchain = {'name': 'dummy', 'version': 'dummy'}
+
+dependencies = [
+    ('GNU/' + version, EXTERNAL_MODULE),
+]
+
+moduleclass = 'compiler'
+--------------------------------------------------------------------------