Fix linking issues:
 * underlinking GLUT (bug #372123, #387609)
 * as-needed (bug #281258)

--- a/src/celestia/Makefile.am
+++ b/src/celestia/Makefile.am
@@ -7,14 +7,15 @@
 
 if ENABLE_KDE
 SUBDIRS += kde
-celestiaKDELIBS = $(LIB_QT) $(LIB_KDECORE) $(LIB_KDEUI) $(LIB_KFILE) \
-                  $(LIBSOCKET) -lDCOP kde/libkdegui.a
+celestiaKDELIBS = kde/libkdegui.a
 celestia_LDFLAGS = $(all_libraries) $(KDE_RPATH)
+LIBS += $(LIB_QT) $(LIB_KDECORE) $(LIB_KDEUI) $(LIB_KFILE) $(LIBSOCKET) -lDCOP
 endif
 
 if ENABLE_GTK
 SUBDIRS += gtk
-celestiaGTKLIBS = $(GTK_LIBS) gtk/libgtkgui.a
+celestiaGTKLIBS = gtk/libgtkgui.a
+LIBS += $(GTK_LIBS)
 endif
 
 COMMONSOURCES = \
@@ -62,6 +63,7 @@
 
 if ENABLE_GLUT
 GLUTSOURCES = glutmain.cpp
+GLUTLIBS = -lGL
 endif
 
 if ENABLE_THEORA
@@ -80,15 +82,16 @@
 celestia_LDADD = \
 	$(celestiaKDELIBS) \
 	$(celestiaGTKLIBS) \
-	$(DL_LIBS) \
-	$(LUA_LIBS) \
-	$(THEORA_LIBS) \
 	../celengine/libcelengine.a \
 	../celtxf/libceltxf.a \
 	../cel3ds/libcel3ds.a \
 	../celmath/libcelmath.a \
 	../celutil/libcelutil.a \
-	$(SPICE_LIBS)
+	$(LUA_LIBS) \
+	$(THEORA_LIBS) \
+	$(GLUTLIBS) \
+	$(SPICE_LIBS) \
+	$(DL_LIBS)
 
 noinst_HEADERS = $(wildcard *.h)
 noinst_DATA = ../../celestia