= RPM How-To for developers =
[[PageOutline]]
Information's for developers: will explain the basic development cycle, from getting the source code, get it running under OS/2, create a diff file suitable for packaging.

== Setup compiler ==
Once your local environment is working ok, to install the current gcc compilers, please install the following packages:

{{{
yum install libc-devel
yum install gcc
}}}

You should also install watcom linker and resource compiler

{{{
yum install gcc-wlink
yum install gcc-wrc
}}}

Your CONFIG.SYS will be updated to allow gcc parser to use the new tools.

== Setup configure script ==
To setup your test tree with same variable configuration used by rpmbuild, you can use the following configure script wrapper:
{{{
CONFIG_SHELL=/bin/sh
export CONFIG_SHELL
LDFLAGS="-Zbin-files -Zhigh-mem -Zomf -Zargs-wild -Zargs-resp"
export LDFLAGS
LIBS="-lurpo -lmmap -lpthread"
export LIBS
CFLAGS="-O2 -g -march=i386 -mtune=i686 -Wall -W -Wmissing-prototypes -Wmissing-declarations"
export CFLAGS
BASECFLAGS="-O2 -g -march=i386 -mtune=i686"
export BASECFLAGS
CXXFLAGS="-O2 -g -march=i386 -mtune=i686"
export CXXFLAGS
FFLAGS="-O2 -g -march=i386 -mtune=i686"
export FFLAGS
./configure --host=i386-pc-os2-emx --build=i386-pc-os2-emx --program-prefix= --prefix=/@unixroot/usr \
        --exec-prefix=/@unixroot/usr --bindir=/@unixroot/usr/bin --sbindir=/@unixroot/usr/sbin \
        --sysconfdir=/@unixroot/etc --datadir=/@unixroot/usr/share --includedir=/@unixroot/usr/include \
        --libdir=/@unixroot/usr/lib --libexecdir=/@unixroot/usr/libexec --localstatedir=/@unixroot/var \
        --sharedstatedir=/@unixroot/usr/com --mandir=/@unixroot/usr/share/man --infodir=/@unixroot/usr/share/info \
   --enable-shared --disable-static \
   --disable-milter \
   --disable-rpath \
   --with-dbdir=/@unixroot/var/lib/clamav \
   --enable-languages=c --disable-ltdl-install --disable-fdpassing \
   --enable-check --disable-clamav \
   --disable-check \
   --disable-llvm \
   "--cache-file=F:/rpmbuild/cache/clamav.cache"
}}}
name it 'configure.rpm' and place in same directory of configure script.
The first part of the configure line holds all system variables and must not be changed, the other lines have application specific parameters. This example is taken from ClamAV project.