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Description of problem:
rpmbuild --rebuild redhat-artwork-0.48-2.src.rpm fails at compile of
bluecurve1_theme_main.c if gdk-pixbuf-devel is not installed.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. rpm -e gdk-pixbuf-devel
2. rpmbuild --rebuild redhat-artwork-0.48-2.src.rpm
	

Actual Results:  make[5]: Entering directory
`/usr/src/redhat/BUILD/redhat-artwork-0.48/art/gtk/Bluecurve1'
/bin/sh ../../../libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I../../..
-I/usr/include/gtk-1.2 -I/usr/include/glib-1.2 -I/usr/lib/gli
b/include -I/usr/X11R6/include   -DQT_THREAD_SUPPORT  -D_REENTRANT  -ansi -W
-Wall -pedantic -Wshadow -Wpointer-arith -Wmissing-prototypes -
Wwrite-strings -D_XOPEN_SOURCE=500 -D_BSD_SOURCE -O2  -O2 -march=i386 -mcpu=i686
-Wall -c bluecurve1_theme_main.c
gcc -DHAVE_CONFIG_H -I. -I. -I../../.. -I/usr/include/gtk-1.2
-I/usr/include/glib-1.2 -I/usr/lib/glib/include -I/usr/X11R6/include -DQT_THRE
AD_SUPPORT -D_REENTRANT -ansi -W -Wall -pedantic -Wshadow -Wpointer-arith
-Wmissing-prototypes -Wwrite-strings -D_XOPEN_SOURCE=500 -D_BSD_SO
URCE -O2 -O2 -march=i386 -mcpu=i686 -Wall -c bluecurve1_theme_main.c  -fPIC
-DPIC -o bluecurve1_theme_main.lo
bluecurve1_theme_main.c:3:35: gdk-pixbuf/gdk-pixbuf.h: No such file or directory
bluecurve1_theme_main.c:521: parse error before '*' token
[errors truncated]

Expected Results:  if gdk-pixbuf-devel is installed, rpmbuild should complete to
success.  If not installed, rpmbuild should fail immediately indicating
gdk-pixbuf-devel requirement.

Additional info: