--- a/qt4/common.pro.in
+++ b/qt4/common.pro.in
@@ -4,8 +4,9 @@
                @abs_top_srcdir@ @abs_top_srcdir@/uim \
                @abs_top_srcdir@/replace
 QMAKE_LIBDIR += @abs_top_builddir@/uim @abs_top_builddir@/replace \
-                @abs_top_builddir@/replace/.libs @abs_top_builddir@/uim/.libs
-LIBS += -lreplace -luim -luim-scm
+                @abs_top_builddir@/replace/.libs @abs_top_builddir@/uim/.libs \
+                @abs_top_builddir@/sigscheme/libgcroots/.libs
+LIBS += -lreplace -luim -luim-scm -lgcroots
 !win32:!embedded:!mac {
     LIBS += -luim-x-util
 }