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running the test program from
http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/snippits/snippet128.html

and the following error:
Exception in thread "main" org.eclipse.swt.SWTError: No more handles
(java.lang.UnsatisfiedLinkError:
/usr/lib/eclipse-3/plugins/org.eclipse.swt.gtk_3.0.0/os/linux/x86/libswt-mozilla-gtk-3062.so:
/usr/lib/eclipse-3/plugins/org.eclipse.swt.gtk_3.0.0/os/linux/x86/libswt-mozilla-gtk-3062.so:
undefined symbol: NS_InitEmbedding)
        at org.eclipse.swt.SWT.error(SWT.java:2717)
        at org.eclipse.swt.SWT.error(SWT.java:2616)
        at org.eclipse.swt.browser.Browser.<init>(Browser.java:122)
        at SWTBrowser.main(SWTBrowser.java:52)
*** Stack trace of contained error ***
java.lang.UnsatisfiedLinkError:
/usr/lib/eclipse-3/plugins/org.eclipse.swt.gtk_3.0.0/os/linux/x86/libswt-mozilla-gtk-3062.so:
/usr/lib/eclipse-3/plugins/org.eclipse.swt.gtk_3.0.0/os/linux/x86/libswt-mozilla-gtk-3062.so:
undefined symbol: NS_InitEmbedding
        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
        at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1560)
        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1485)
        at java.lang.Runtime.loadLibrary0(Runtime.java:788)
        at java.lang.System.loadLibrary(System.java:834)
        at org.eclipse.swt.internal.Library.loadLibrary(Library.java:100)
        at org.eclipse.swt.browser.Browser.<init>(Browser.java:119)
        at SWTBrowser.main(SWTBrowser.java:52)

It seems like libswt-mozilla-gtk-3062.so doesn't link against
/usr/lib/mozilla/libgtkembedmoz.so properly. So I change the ebuild a bit, and
now it works.

Reproducible: Always
Steps to Reproduce:
1.
2.
3.

Created an attachment (id=35054) [details]
eclipse-sdk-3.0.0.ebuild

here are the changes:
--- eclipse-sdk-3.0.0.ebuild~	2004-07-07 07:35:49.000000000 +0800
+++ eclipse-sdk-3.0.0.ebuild	2004-07-09 14:55:36.000000000 +0800
@@ -64,6 +64,14 @@
  
	# If neither enabled, default to gtk+
	${use_gtk} || ${use_motif} || use_gtk='true'
+
+	if ${use_gtk} && use mozilla && [ ! -f
${ROOT}/usr/lib/mozilla/libgtkembedmoz.so ]
+	then
+		eerror "you need mozilla compiled against gtk+-2"
+		eerror "export USE=\"gtk2\" ;emerge mozilla -p "
+		eerror "or remove \"mozilla\" from use flags"
+		die "Need Mozilla compiled with gtk+-2.0!!"
+	fi
 }
  
 set_dirs() {
@@ -133,7 +141,7 @@
		-e "s:\`pkg-config --libs gnome-vfs-module-2.0 libgnome-2.0
libgnomeui-2.0\`:${gnome_lib}:" \
		-e "s:-I\$(JAVA_HOME)/include:-I\$(JAVA_HOME)/include
-I\$(JAVA_HOME)/include/linux:" \
		-e "s:-I\$(JAVA_HOME)\t:-I\$(JAVA_HOME)/include
-I\$(JAVA_HOME)/include/linux:" \
-		-e "s:-L\$(MOZILLA_HOME)/lib
-lembed_base_s:-L\$(MOZILLA_HOME):" \
+		-e "s:-L\$(MOZILLA_HOME)/lib -lembed_base_s:-L\$(MOZILLA_HOME)
-lgtkembedmoz:" \
		-e "s:MOZILLACFLAGS = -O:MOZILLACFLAGS = -O -fPIC:" \
		-e "s:\$(JAVA_HOME)/jre/bin:\$(JAVA_HOME)/jre/lib/i386:" \
		-i make_gtk.mak

Yup, you're right. This is one of the things I've been wanting to do, but
never got around to actually testing it. Thanks a lot!

Fixed (hopefully). Check out dev-util/eclipse-sdk-3.0.0-r1 or newer.