There are different ways to create rpm package of your application / tool like using checkinstall, writing app.spec file etc. The Best one is writing rpm specification file.
Below you can find a sample Specification file gem.spec to create RPM package, which I actually used to create gem-beta-0.1.rpm package.
Author: Reniguntla Sambaiah
File Name : gem.spec
******************************************************************************
Summary: GEM(GEstures with Mouse) is gesture based application which assists physically challenged in accessing Linux Desktops
Name: gem
Version: 0.1
Release: 1
Group: Accessibility
License: GPLv3
Prefix: /usr/local
Source0: %{name}-beta-%{version}.tar.gz
BuildRequires: gtkmm24-devel
BuildRequires: dbus-glib-devel
BuildRequires: boost-devel
BuildRequires: gcc-c++
BuildRequires: intltool
%description
A gesture-recognition application for Physically challenged to access Linux Desktops
%prep
%setup -q -n %{name}-beta-%{version}
sed -i -e 's:/usr/local:%{_prefix}:' Makefile
%build
%{__make} CXX="g++ %{optflags}" \
CC="gcc -std=c99 %{optflags}" \
LDFLAGS="%{ldflags}"
%install
rm -rf %{buildroot}
make DESTDIR=%{buildroot} install
%files
%doc AUTHORS INSTALL LICENSE README
%{_bindir}/%{name}
%{_datadir}/applications/%{name}.desktop
%{_datadir}/icons/hicolor/scalable/apps/%{name}.svg
