diff --git a/atk/ext/atk/depend b/atk/ext/atk/depend
index c49c37e..3394f4a 100644
--- a/atk/ext/atk/depend
+++ b/atk/ext/atk/depend
@@ -1,8 +1,6 @@
-install-so:
+install:
 	$(INSTALL_DATA) $(srcdir)/rbatk.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) rbatkversion.h $(RUBYARCHDIR)
-
-install:
 	if test -n "$(pkgconfigdir)"; then			\
 	  $(MAKEDIRS) $(pkgconfigdir);				\
 	  $(INSTALL_DATA) ruby-atk.pc $(pkgconfigdir);		\
diff --git a/gdk3/ext/gdk3/depend b/gdk3/ext/gdk3/depend
index 8a3c3e2..bcfb26c 100644
--- a/gdk3/ext/gdk3/depend
+++ b/gdk3/ext/gdk3/depend
@@ -1,8 +1,6 @@
-install-so:
+install:
 	$(INSTALL_DATA) $(srcdir)/rbgdk3.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) $(srcdir)/rbgdk3conversions.h $(RUBYARCHDIR)
-
-install:
 	if test -n "$(pkgconfigdir)"; then			\
 	  $(MAKEDIRS) $(pkgconfigdir);				\
 	  $(INSTALL_DATA) ruby-gdk3.pc $(pkgconfigdir);		\
diff --git a/gdk_pixbuf2/ext/gdk_pixbuf2/depend b/gdk_pixbuf2/ext/gdk_pixbuf2/depend
index d091c46..d175648 100644
--- a/gdk_pixbuf2/ext/gdk_pixbuf2/depend
+++ b/gdk_pixbuf2/ext/gdk_pixbuf2/depend
@@ -1,8 +1,6 @@
-install-so:
+install:
 	$(INSTALL_DATA) $(srcdir)/rbgdk-pixbuf.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) $(srcdir)/rbgdk-pixbuf2conversions.h $(RUBYARCHDIR)
-
-install:
 	if test -n "$(pkgconfigdir)"; then			\
 	  $(MAKEDIRS) $(pkgconfigdir);				\
 	  $(INSTALL_DATA) ruby-gdk-pixbuf2.pc $(pkgconfigdir);	\
diff --git a/glib2/ext/glib2/depend b/glib2/ext/glib2/depend
index f601650..2cdbd2c 100644
--- a/glib2/ext/glib2/depend
+++ b/glib2/ext/glib2/depend
@@ -1,4 +1,4 @@
-install-so:
+install:
 	$(INSTALL_DATA) $(srcdir)/rbglib.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) $(srcdir)/rbglibdeprecated.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) $(srcdir)/rbglib2conversions.h $(RUBYARCHDIR)
@@ -8,8 +8,6 @@ install-so:
 	$(INSTALL_DATA) $(srcdir)/rbgobject.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) $(srcdir)/rbgcompat.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) glib-enum-types.h $(RUBYARCHDIR)
-
-install:
 	if test -n "$(pkgconfigdir)"; then			\
 	  $(MAKEDIRS) $(pkgconfigdir);				\
 	  $(INSTALL_DATA) ruby-glib2.pc $(pkgconfigdir);	\
diff --git a/gtk2/ext/gtk2/depend b/gtk2/ext/gtk2/depend
index 2c6cae3..4fb0341 100644
--- a/gtk2/ext/gtk2/depend
+++ b/gtk2/ext/gtk2/depend
@@ -1,11 +1,9 @@
-install-so:
+install:
 	$(INSTALL_DATA) $(srcdir)/rbgdk.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) $(srcdir)/rbgdkconversions.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) $(srcdir)/rbgtk.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) $(srcdir)/rbgtkconversions.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) $(srcdir)/rbgtkmacros.h $(RUBYARCHDIR)
-
-install:
 	if test -n "$(pkgconfigdir)"; then			\
 	  $(MAKEDIRS) $(pkgconfigdir);				\
 	  $(INSTALL_DATA) ruby-gtk2.pc $(pkgconfigdir);		\
diff --git a/gtk3/ext/gtk3/depend b/gtk3/ext/gtk3/depend
index a72fdd2..7f416c1 100644
--- a/gtk3/ext/gtk3/depend
+++ b/gtk3/ext/gtk3/depend
@@ -1,8 +1,6 @@
-install-so:
+install:
 	$(INSTALL_DATA) $(srcdir)/rbgtk3.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) $(srcdir)/rbgtk3conversions.h $(RUBYARCHDIR)
-
-install:
 	if test -n "$(pkgconfigdir)"; then			\
 	  $(MAKEDIRS) $(pkgconfigdir);				\
 	  $(INSTALL_DATA) ruby-gtk3.pc $(pkgconfigdir);		\
diff --git a/pango/ext/pango/depend b/pango/ext/pango/depend
index 638a1d7..1454898 100644
--- a/pango/ext/pango/depend
+++ b/pango/ext/pango/depend
@@ -1,9 +1,7 @@
-install-so:
+install:
 	$(INSTALL_DATA) $(srcdir)/rbpango.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) $(srcdir)/rbpangoconversions.h $(RUBYARCHDIR)
 	$(INSTALL_DATA) rbpangoversion.h $(RUBYARCHDIR)
-
-install:
 	if test -n "$(pkgconfigdir)"; then			\
 	  $(MAKEDIRS) $(pkgconfigdir);				\
 	  $(INSTALL_DATA) ruby-pango.pc $(pkgconfigdir);	\