I needed to install the openni_camera ROS Groovy package on my Fedora 18 system. I ran into a few issues which I managed to solve. Documenting it all here for any one else who might need it:

You need to clone the git repository in your catkin workspace src directory, and then build the package using catkin:

$ cd ~/ros_catkin_ws/src #your catkin source directory
$ git clone https://github.com/ros-drivers/openni_camera

The Cmakelists.txt file looks for openni via a cmake system which doesn't work in Fedora due to missing pkg-config files. This patch will fix the CMakeLists.txt file for you. I've hosted the patch here for your convenience.

[ankur@localhost  openni_camera(groovy-devel *%=)]$ diff -u CMakeLists.txt.orig CMakeLists.txt
--- CMakeLists.txt.orig 2013-04-08 14:40:39.798336741 +1000
+++ CMakeLists.txt      2013-04-08 14:43:14.466829031 +1000
@@ -5,9 +5,11 @@
 find_package(Boost COMPONENTS system filesystem thread REQUIRED)

 find_package(PkgConfig)
-pkg_check_modules(PC_LIBOPENNI REQUIRED libopenni)
+# pkg_check_modules(PC_LIBOPENNI REQUIRED libopenni)
+FIND_PATH(PC_LIBOPENNI_INCLUDE_DIRS "XnOpenNI.h" "OpenNIConfig.h" HINTS "$ENV{OPEN_NI_INCLUDE}" "/usr/include/ni")
+FIND_LIBRARY(PC_LIBOPENNI_LIBRARIES NAMES OpenNI libOpenNI HINTS "$ENV{OPEN_NI_LIB}" "/usr/lib64")

-#message("Hello world ${PC_LIBOPENNI_LIBRARIES} ${PC_LIBOPENNI_INCLUDEDIR}")
+message("Hello world ${PC_LIBOPENNI_LIBRARIES} ${PC_LIBOPENNI_INCLUDE_DIRS}")

 generate_dynamic_reconfigure_options(cfg/OpenNI.cfg)

[ankur@localhost  openni_camera(groovy-devel *%=)]$

Once done patching, install the openni-devel package

$ sudo yum install openni-devel

Then, simply run the catkin make command:

$ cd ~/ros_catkin_ws
$ catkin_make_isolated --install -DSETUPTOOLS_DEB_LAYOUT=OFF --pkg openni_camera

That's all. The package should now be set up.