noinst_LIBRARIES += lib/gtksheet/libgtksheet.a
-lib_gtksheet_libgtksheet_a_CFLAGS = $(GTK_CFLAGS) -Wall
+lib_gtksheet_libgtksheet_a_CFLAGS = $(GTK_CFLAGS) -Wall -DGDK_MULTIHEAD_SAFE=1
lib_gtksheet_libgtksheet_a_SOURCES = \
lib/gtksheet/gsheet-uniform-column.h \
lib/gtksheet/gsheet-uniform-row.c \
lib/gtksheet/gsheet-uniform-row.h \
- lib/gtksheet/gtkextra.c \
lib/gtksheet/gtkextrafeatures.h \
lib/gtksheet/gtkextra-marshal.c \
lib/gtksheet/gtkextra-marshal.h \