* Using: sun-jdk-1.6
>>> Unpacking source...
>>> Unpacking ./src.zip to /var/tmp/portage/dev-java/swt-3.5/work
>>> Source unpacked in /var/tmp/portage/dev-java/swt-3.5/work
>>> Preparing source in /var/tmp/portage/dev-java/swt-3.5/work ...
 * Applying as-needed-and-flag-fixes.patch ...
  [ ok ]
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-java/swt-3.5/work ...
Rewriting attributes
Rewriting ./build.xml
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-java/swt-3.5/work ...
 * Building AWT library
make -j2 -f make_linux.mak NO_STRIP=y CC=x86_64-pc-linux-gnu-gcc CXX=x86_64-pc-linux-gnu-g++ make_awt 
x86_64-pc-linux-gnu-gcc -mtune=k8 -O2 -pipe -march=athlon64 -msse -msse2 -mmmx -m3dnow -DSWT_VERSION=3550  -DLINUX -DGTK -I/opt/sun-jdk-1.6.0.17/include -I/opt/sun-jdk-1.6.0.17/include/linux -fPIC -DSWT_PTR_SIZE_64   -c -o swt_awt.o swt_awt.c
x86_64-pc-linux-gnu-gcc -Wl,-O1 -o libswt-awt-gtk-3550.so swt_awt.o -L/opt/sun-jdk-1.6.0.17/jre/lib/amd64 -ljawt -shared
 * Building SWT library
make -j2 -f make_linux.mak NO_STRIP=y CC=x86_64-pc-linux-gnu-gcc CXX=x86_64-pc-linux-gnu-g++ make_swt 
x86_64-pc-linux-gnu-gcc -mtune=k8 -O2 -pipe -march=athlon64 -msse -msse2 -mmmx -m3dnow -DSWT_VERSION=3550  -DLINUX -DGTK -I/opt/sun-jdk-1.6.0.17/include -I/opt/sun-jdk-1.6.0.17/include/linux -fPIC -DSWT_PTR_SIZE_64 -c swt.c
x86_64-pc-linux-gnu-gcc -mtune=k8 -O2 -pipe -march=athlon64 -msse -msse2 -mmmx -m3dnow -DSWT_VERSION=3550  -DLINUX -DGTK -I/opt/sun-jdk-1.6.0.17/include -I/opt/sun-jdk-1.6.0.17/include/linux -fPIC -DSWT_PTR_SIZE_64   -c -o c.o c.c
x86_64-pc-linux-gnu-gcc -mtune=k8 -O2 -pipe -march=athlon64 -msse -msse2 -mmmx -m3dnow -DSWT_VERSION=3550  -DLINUX -DGTK -I/opt/sun-jdk-1.6.0.17/include -I/opt/sun-jdk-1.6.0.17/include/linux -fPIC -DSWT_PTR_SIZE_64   -c -o c_stats.o c_stats.c
x86_64-pc-linux-gnu-gcc -mtune=k8 -O2 -pipe -march=athlon64 -msse -msse2 -mmmx -m3dnow -DSWT_VERSION=3550  -DLINUX -DGTK -I/opt/sun-jdk-1.6.0.17/include -I/opt/sun-jdk-1.6.0.17/include/linux -fPIC -DSWT_PTR_SIZE_64 -DUSE_ASSEMBLER -c callback.c
x86_64-pc-linux-gnu-gcc -mtune=k8 -O2 -pipe -march=athlon64 -msse -msse2 -mmmx -m3dnow -DSWT_VERSION=3550  -DLINUX -DGTK -I/opt/sun-jdk-1.6.0.17/include -I/opt/sun-jdk-1.6.0.17/include/linux -fPIC -DSWT_PTR_SIZE_64 `pkg-config --cflags gtk+-2.0` -c os.c
In file included from os_structs.h:16,
                 from os.c:17:
os.h:83:34: error: X11/extensions/XTest.h: No such file or directory
os.c: In function 'Java_org_eclipse_swt_internal_gtk_OS__1gtk_1message_1dialog_1new':
os.c:9389: warning: format not a string literal and no format arguments
make: *** [os.o] Error 1
make: *** Waiting for unfinished jobs....
 * 
 * ERROR: dev-java/swt-3.5 failed.
 * Call stack:
 *               ebuild.sh, line   49:  Called src_compile
 *             environment, line 4489:  Called die
 * The specific snippet of code:
 *       ${make} make_swt || die "Failed to build SWT support";
 *  The die message:
 *   Failed to build SWT support
 * 
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at '/var/log/portage/dev-java:swt-3.5:20091107-104756.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-java/swt-3.5/temp/environment'.
 * 
!!! When you file a bug report, please include the following information:
GENTOO_VM=sun-jdk-1.6  CLASSPATH="" JAVA_HOME="/opt/sun-jdk-1.6.0.17"
JAVACFLAGS="-source 1.4 -target 1.4" COMPILER=""
and of course, the output of emerge --info