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How to compile an RPM

First install the dependencies as root:

    yum install arduino-core rpm-build

    # or on Fedora 22+

    dnf install arduino-core rpmdevtools

From the top-level Arduino-Makefile directory you've checked out of github, run the following (as unprivileged user) to create a compressed tarball using the naming conventions required by rpmbuild:

git archive HEAD --prefix=arduino-mk-1.5/ -o ../arduino-mk-1.5.tar.gz

If you don't already have a rpmbuild setup (e.g. you've not installed the SRPM) you will need to create the directories:

mkdir -p ~/rpmbuild/{SOURCES,SPECS}

Then copy the tarball and specfile into those directories:

cp ../arduino-mk-1.5.tar.gz ~/rpmbuild/SOURCES/
cp packaging/fedora/arduino-mk.spec ~/rpmbuild/SPECS/

Then compile. This will create a binary and source RPM:

cd ~/rpmbuild/SPECS/
rpmbuild -ba arduino-mk.spec

Fedora's AVR compilers use ccache, so you may have to override some of the paths to the AVR tools in your sketch's Makefile, for example:

CC      = /usr/lib64/ccache/$(CC_NAME)
CXX     = /usr/lib64/ccache/$(CXX_NAME)
AS      = /usr/bin/$(AS_NAME)
AR      = /usr/bin/$(AR_NAME)
SIZE    = /usr/bin/$(SIZE_NAME)
NM      = /usr/bin/$(NM_NAME)

Or if you don't want to use ccache, then just set AVR_TOOLS_PATH=/usr and none of the above will be necessary.