I couldn't get the patch working so I made my own.

--- CMakeLists.txt.orig 2010-01-19 23:45:13.000000000 -0600
+++ CMakeLists.txt 2010-01-19 23:42:13.000000000 -0600
@@ -4,7 +4,6 @@
# Find the required Libaries
find_package( KDE4 REQUIRED )
include( KDE4Defaults )
-find_package( Plasma REQUIRED )

add_definitions ( ${QT_DEFINITIONS} ${KDE4_DEFINITIONS} )
include_directories(
@@ -14,4 +13,13 @@
)

add_subdirectory( src )
-add_subdirectory( misc )
+add_subdirectory( misc )
+
+set(countdown_SRCS src/countdown.cpp)
+kde4_add_ui_files(countdown_SRCS src/countdownConfig.ui)
+
+kde4_add_plugin(plasma_applet_countdown ${countdown_SRCS})
+target_link_libraries(plasma_applet_countdown ${KDE4_PLASMA_LIBS} ${KDE4_KDEUI_LIBS})
+
+install(TARGETS plasma_applet_countdown DESTINATION ${PLUGIN_INSTALL_DIR})
+install(FILES misc/plasma-applet-countdown.desktop DESTINATION ${SERVICES_INSTALL_DIR})


patch the CMakeLists.txt under the plasmoid-countdown-0.2.2 directory. patch CMakeLists.txt < patch then run the following commands.

cd plasmoid-countdown-0.2.2
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=`kde4-config --prefix` ../
make
make install

I've put together a how-to to make it easier to get this working on KDE 4.3.2. These instructions are for Debian-based systems, tested on K/Ubuntu Karmic (9.10).

Install the build-essential, cmake and kdelibs5-dev packages:
sudo apt-get install build-essential cmake kdelibs5-dev

Download plasmoid source code from this page.

Untar the source file, ex.:
tar -xvf plasmoid-countdown_0.2.2.orig.tar.gz

Move into the directory created above, ex.:
cd plasmoid-countdown_0.2.2

Patch the CMakeList.txt files (see patches below; note that there should be spaces leading all lines that don't start with - or +).

Save the text below into separate files in the indicated directories (use kate or nano to create the files). Then, issue the commands indicated to patch the cmake config files to make the changes indicated.

patch1.txt (save to current directory (ex., plasmoid-countdown_0.2.2))
[code]
--- CMakeLists.txt.ORIG 2009-11-28 19:47:47.000000000 -0500
+++ CMakeLists.txt 2009-11-28 20:02:24.000000000 -0500
@@ -4,7 +4,6 @@
# Find the required Libaries
find_package( KDE4 REQUIRED )
include( KDE4Defaults )
-find_package( Plasma REQUIRED )

add_definitions ( ${QT_DEFINITIONS} ${KDE4_DEFINITIONS} )
include_directories(
[/code]

patch2.txt (save to src/CMakeLists.txt)
[code]
--- CMakeLists.txt.ORIG 2009-11-28 20:02:45.000000000 -0500
+++ CMakeLists.txt 2009-11-28 20:04:28.000000000 -0500
@@ -5,7 +5,7 @@
# Now make sure all files get to the right place
kde4_add_plugin(plasma_applet_countdown ${countdown_SRCS})
target_link_libraries(plasma_applet_countdown
- ${PLASMA_LIBS} ${KDE4_KDEUI_LIBS})
+ ${KDE4_PLASMA_LIBS} ${KDE4_KDEUI_LIBS})

install(TARGETS plasma_applet_countdown
DESTINATION ${PLUGIN_INSTALL_DIR})
[/code]

From the main working directory (ex., plasmoid-countdown_0.2.2):
patch CMakeLists.txt < patch1.txt

patch src/CMakeLists.txt < src/patch2.txt

Configure the build for your machine:
cmake .

Build the project:
make plasma_applet_countdown

Install the project:
sudo make install

Now the plasmoid should be found in the widgets list.

--- plasmoid-countdown-0.2.2/CMakeLists.txt~ 2009-09-09 22:58:30.964556838 +0200
+++ plasmoid-countdown-0.2.2/CMakeLists.txt 2009-09-09 22:58:37.412060368 +0200
@@ -4,7 +4,6 @@
# Find the required Libaries
find_package( KDE4 REQUIRED )
include( KDE4Defaults )
-find_package( Plasma REQUIRED )

add_definitions ( ${QT_DEFINITIONS} ${KDE4_DEFINITIONS} )
include_directories(
--- plasmoid-countdown-0.2.2/src/CMakeLists.txt~ 2009-09-09 22:59:17.530134595 +0200
+++ plasmoid-countdown-0.2.2/src/CMakeLists.txt 2009-09-09 22:59:04.410671153 +0200
@@ -5,7 +5,7 @@
# Now make sure all files get to the right place
kde4_add_plugin(plasma_applet_countdown ${countdown_SRCS})
target_link_libraries(plasma_applet_countdown
- ${PLASMA_LIBS} ${KDE4_KDEUI_LIBS})
+ ${KDE4_PLASMA_LIBS} ${KDE4_KDEUI_LIBS})

install(TARGETS plasma_applet_countdown
DESTINATION ${PLUGIN_INSTALL_DIR})

Yes, it work (on kde 4.2.4 also).
Thanks!

What with KDE 4.2 ?

...to see you have updated this cool plasmoid!

Thank you!

Nice dark colours¡¡

This more or less makes it compile under ~4.1

57c57
< setDrawStandardBackground(true);
---
> setBackgroundHints(DefaultBackground);
87c87
< setNeedsConfiguring( true );
---
> setConfigurationRequired( true );
90c90
< setMinimumContentSize(40, 50);
---
> // setMinimumContentSize(40, 50);
281c281
< setNeedsConfiguring( false );
---
> setConfigurationRequired( false );

Please can you upgrade to 4.1 API ? Thanks

I tried compiling this with:

cmake . -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=RELEASE

and then make

I get this error:

[ 33%] Building CXX object src/CMakeFiles/plasma_applet_countdown.dir/countdown.o
cd /home/kalidarn/builds/kdemod-extragear-plasmoid-countdown/src/countdown-0.1/src && /usr/bin/c++ -D_BSD_SOURCE -D_XOPEN_SOURCE=500 -D_BSD_SOURCE -DQT_NO_STL -DQT_NO_CAST_TO_ASCII -D_REENTRANT -DKDE_DEPRECATED_WARNINGS -Dplasma_applet_countdown_EXPORTS -march=i686 -mtune=generic -O2 -pipe -Wnon-virtual-dtor -Wno-long-long -ansi -Wundef -Wcast-align -Wchar-subscripts -Wall -W -Wpointer-arith -Wformat-security -fno-exceptions -fno-check-new -fno-common -Woverloaded-virtual -fno-threadsafe-statics -fvisibility=hidden -fvisibility-inlines-hidden -O2 -DNDEBUG -DQT_NO_DEBUG -fPIC -I/home/kalidarn/builds/kdemod-extragear-plasmoid-countdown/src/countdown-0.1/src -I/home/kalidarn/builds/kdemod-extragear-plasmoid-countdown/src/countdown-0.1 -I/usr/include/KDE -I/usr/include/QtWebKit -I/usr/include/QtHelp -I/usr/include/QtAssistant -I/usr/include/QtDBus -I/usr/include/QtTest -I/usr/include/QtUiTools -I/usr/include/QtScript -I/usr/include/QtSvg -I/usr/include/QtXml -I/usr/include/QtSql -I/usr/include/QtOpenGL -I/usr/include/QtNetwork -I/usr/include/QtDesigner -I/usr/include/Qt3Support -I/usr/include/QtGui -I/usr/include/QtCore -I/usr/include/Qt -I/usr/share/qt/mkspecs/default -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -o CMakeFiles/plasma_applet_countdown.dir/countdown.o -c /home/kalidarn/builds/kdemod-extragear-plasmoid-countdown/src/countdown-0.1/src/countdown.cpp
/home/kalidarn/builds/kdemod-extragear-plasmoid-countdown/src/countdown-0.1/src/countdown.cpp: In constructor ‘Countdown::Countdown(QObject*, const QVariantList&)’:
/home/kalidarn/builds/kdemod-extragear-plasmoid-countdown/src/countdown-0.1/src/countdown.cpp:57: error: ‘setDrawStandardBackground’ was not declared in this scope
/home/kalidarn/builds/kdemod-extragear-plasmoid-countdown/src/countdown-0.1/src/countdown.cpp: In member function ‘virtual void Countdown::init()’:
/home/kalidarn/builds/kdemod-extragear-plasmoid-countdown/src/countdown-0.1/src/countdown.cpp:87: error: ‘setNeedsConfiguring’ was not declared in this scope
/home/kalidarn/builds/kdemod-extragear-plasmoid-countdown/src/countdown-0.1/src/countdown.cpp:90: error: ‘setMinimumContentSize’ was not declared in this scope
/home/kalidarn/builds/kdemod-extragear-plasmoid-countdown/src/countdown-0.1/src/countdown.cpp: In member function ‘void Countdown::configAccepted()’:
/home/kalidarn/builds/kdemod-extragear-plasmoid-countdown/src/countdown-0.1/src/countdown.cpp:281: error: ‘setNeedsConfiguring’ was not declared in this scope
make[2]: *** [src/CMakeFiles/plasma_applet_countdown.dir/countdown.o] Error 1
make[2]: Leaving directory `/home/kalidarn/builds/kdemod-extragear-plasmoid-countdown/src/countdown-0.1'
make[1]: *** [src/CMakeFiles/plasma_applet_countdown.dir/all] Error 2
make[1]: Leaving directory `/home/kalidarn/builds/kdemod-extragear-plasmoid-countdown/src/countdown-0.1'
make: *** [all] Error 2

Also I'm compiling against KDE 4.1.1

KDE 4.1 does not work yet, sorry. It is on my list of things, but unfortunately I had very little time.

It'd be cool if you could update the widget to use the new 4.1 api. :)

script

please update to 4.1

I recommend you add a fuction where you can set where you do countdown for.

Example kde4.1

So you should have then: 4 months till kde4.1

It would be nice to be able to define a string that displays the target of the countdown. Something like:
"time" till Release of KDE 4.1

So that one can see, for what the countdown is meant. Otionally with an image or so.

Labels are on the Todo list. I still need to figure out a good way to adjust the label size and the size of the displayed time to the size of the applet.

I have build packages for openSUSE 10.2 and newer, you can find them here:
http://software.opensuse.org/search?baseproject=ALL&p=1&q=kde4-plasmoid-countdown

Thanks, I added this to the download options.