Building with NEWBUILD=false on linux-i586 fails with the following error:

Entering directory `/home/smullan/hg/jdk8/deploy-revocation-3/jdk/make/sun/splashscreen'
Makefile:86: Extraneous text after `ifeq' directive
/usr/bin/gcc -O2 -fno-strict-aliasing -fPIC -W -Wall -Wno-unused -Wno-parentheses -fno-omit-frame-pointer -D_LITTLE_ENDIAN -DSPLASHSCREEN -DWITH_X11 -DNDEBUG -DARCH='"i586"' -Di586 -DLINUX -DRELEASE='"1.8.0-internal"' -D_LARGEFILE64_SOURCE -D_GNU_SOURCE -D_REENTRANT -I. -I/home/smullan/hg/jdk8/deploy-revocation-3/build/linux-i586/tmp/sun/sun.awt/splashscreen/CClassHeaders -I../../../src/closed/share/javavm/export -I../../../src/solaris/javavm/export -I../../../src/share/javavm/export -I../../../src/share/native/common -I../../../src/solaris/native/common -I../../../src/share/native/sun/awt -I../../../src/solaris/native/sun/awt -DTHIS_FILE='"java_awt_SplashScreen.c"' -I/usr/X11R6//include -I/usr/X11R6//include/X11/extensions -I../../../src/solaris/native/sun/awt/splashscreen -I../../../src/share/native/sun/awt/splashscreen -I../../../src/share/native/sun/awt/image/jpeg -I../../../src/share/native/java/util/zip/zlib-1.2.5 -DPNG_NO_MMX_CODE -c -o /home/smullan/hg/jdk8/deploy-revocation-3/build/linux-i586/tmp/sun/sun.awt/splashscreen/obj/java_awt_SplashScreen.o ../../../src/share/native/sun/awt/splashscreen/java_awt_SplashScreen.c
/usr/bin/gcc -O2 -fno-strict-aliasing -fPIC -W -Wall -Wno-unused -Wno-parentheses -fno-omit-frame-pointer -D_LITTLE_ENDIAN -DSPLASHSCREEN -DWITH_X11 -DNDEBUG -DARCH='"i586"' -Di586 -DLINUX -DRELEASE='"1.8.0-internal"' -D_LARGEFILE64_SOURCE -D_GNU_SOURCE -D_REENTRANT -I. -I/home/smullan/hg/jdk8/deploy-revocation-3/build/linux-i586/tmp/sun/sun.awt/splashscreen/CClassHeaders -I../../../src/closed/share/javavm/export -I../../../src/solaris/javavm/export -I../../../src/share/javavm/export -I../../../src/share/native/common -I../../../src/solaris/native/common -I../../../src/share/native/sun/awt -I../../../src/solaris/native/sun/awt -DTHIS_FILE='"splashscreen_gfx_impl.c"' -I/usr/X11R6//include -I/usr/X11R6//include/X11/extensions -I../../../src/solaris/native/sun/awt/splashscreen -I../../../src/share/native/sun/awt/splashscreen -I../../../src/share/native/sun/awt/image/jpeg -I../../../src/share/native/java/util/zip/zlib-1.2.5 -DPNG_NO_MMX_CODE -c -o /home/smullan/hg/jdk8/deploy-revocation-3/build/linux-i586/tmp/sun/sun.awt/splashscreen/obj/splashscreen_gfx_impl.o ../../../src/share/native/sun/awt/splashscreen/splashscreen_gfx_impl.c
/usr/bin/gcc -O2 -fno-strict-aliasing -fPIC -W -Wall -Wno-unused -Wno-parentheses -fno-omit-frame-pointer -D_LITTLE_ENDIAN -DSPLASHSCREEN -DWITH_X11 -DNDEBUG -DARCH='"i586"' -Di586 -DLINUX -DRELEASE='"1.8.0-internal"' -D_LARGEFILE64_SOURCE -D_GNU_SOURCE -D_REENTRANT -I. -I/home/smullan/hg/jdk8/deploy-revocation-3/build/linux-i586/tmp/sun/sun.awt/splashscreen/CClassHeaders -I../../../src/closed/share/javavm/export -I../../../src/solaris/javavm/export -I../../../src/share/javavm/export -I../../../src/share/native/common -I../../../src/solaris/native/common -I../../../src/share/native/sun/awt -I../../../src/solaris/native/sun/awt -DTHIS_FILE='"splashscreen_gif.c"' -I/usr/X11R6//include -I/usr/X11R6//include/X11/extensions -I../../../src/solaris/native/sun/awt/splashscreen -I../../../src/share/native/sun/awt/splashscreen -I../../../src/share/native/sun/awt/image/jpeg -I../../../src/share/native/java/util/zip/zlib-1.2.5 -DPNG_NO_MMX_CODE -c -o /home/smullan/hg/jdk8/deploy-revocation-3/build/linux-i586/tmp/sun/sun.awt/splashscreen/obj/splashscreen_gif.o ../../../src/share/native/sun/awt/splashscreen/splashscreen_gif.c
../../../src/share/native/sun/awt/splashscreen/splashscreen_gif.c:29:21: fatal error: gif_lib.h: No such file or directory
compilation terminated.
../../../src/share/native/sun/awt/splashscreen/splashscreen_gfx_impl.c: In function 'initFormat':
../../../src/share/native/sun/awt/splashscreen/splashscreen_gfx_impl.c:305:34: warning: 'numBits' may be used uninitialized in this function [-Wuninitialized]
../../../src/share/native/sun/awt/splashscreen/splashscreen_gfx_impl.c:305:34: warning: 'shift' may be used uninitialized in this function [-Wuninitialized]
/usr/bin/gcc -O2 -fno-strict-aliasing -fPIC -W -Wall -Wno-unused -Wno-parentheses -fno-omit-frame-pointer -D_LITTLE_ENDIAN -DSPLASHSCREEN -DWITH_X11 -DNDEBUG -DARCH='"i586"' -Di586 -DLINUX -DRELEASE='"1.8.0-internal"' -D_LARGEFILE64_SOURCE -D_GNU_SOURCE -D_REENTRANT -I. -I/home/smullan/hg/jdk8/deploy-revocation-3/build/linux-i586/tmp/sun/sun.awt/splashscreen/CClassHeaders -I../../../src/closed/share/javavm/export -I../../../src/solaris/javavm/export -I../../../src/share/javavm/export -I../../../src/share/native/common -I../../../src/solaris/native/common -I../../../src/share/native/sun/awt -I../../../src/solaris/native/sun/awt -DTHIS_FILE='"splashscreen_impl.c"' -I/usr/X11R6//include -I/usr/X11R6//include/X11/extensions -I../../../src/solaris/native/sun/awt/splashscreen -I../../../src/share/native/sun/awt/splashscreen -I../../../src/share/native/sun/awt/image/jpeg -I../../../src/share/native/java/util/zip/zlib-1.2.5 -DPNG_NO_MMX_CODE -c -o /home/smullan/hg/jdk8/deploy-revocation-3/build/linux-i586/tmp/sun/sun.awt/splashscreen/obj/splashscreen_impl.o ../../../src/share/native/sun/awt/splashscreen/splashscreen_impl.c
make[5]: *** [/home/smullan/hg/jdk8/deploy-revocation-3/build/linux-i586/tmp/sun/sun.awt/splashscreen/obj/splashscreen_gif.o] Error 1
make[5]: *** Waiting for unfinished jobs....
make[5]: Leaving directory `/home/smullan/hg/jdk8/deploy-revocation-3/jdk/make/sun/splashscreen'
make[4]: *** [library_parallel_compile] Error 2
make[4]: Leaving directory `/home/smullan/hg/jdk8/deploy-revocation-3/jdk/make/sun/splashscreen'
make[3]: *** [all] Error 1
make[3]: Leaving directory `/home/smullan/hg/jdk8/deploy-revocation-3/jdk/make/sun'
make[2]: *** [all] Error 1
make[2]: Leaving directory `/home/smullan/hg/jdk8/deploy-revocation-3/jdk/make'
make[1]: *** [jdk-build] Error 2
make[1]: Leaving directory `/home/smullan/hg/jdk8/deploy-revocation-3'
make: *** [build_product_image] Error 2

It would be nice to fix this. The old build is still required to build certain components such as JCE and deploy, so you have to fix this manually in order to get by this error.