X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=chiark-tcl.git;a=blobdiff_plain;f=Makefile;h=74fc544ad13fa7a8feb90bf7288f6ff5b7803427;hp=9e7377687ba67605bba184b6320ccad310e23815;hb=86cd7fbb005bf50d81314393745c08d7885246fa;hpb=2aaa6d9084b8a950151d64b4fe7a483be59b5722

diff --git a/Makefile b/Makefile
index 9e73776..74fc544 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,22 @@
 
-SUBDIRS=	base adns hbytes cdb crypto
-# dgram tuntap
+SUBDIRS=	base adns hbytes cdb crypto dgram
+
+ifneq ($(wildcard /usr/include/linux/if_tun.h),)
+SUBDIRS+=	tuntap
+endif
+
+ifneq ($(wildcard /usr/include/wiringPi.h /usr/include/arm-*/wiringPi.h),)
+SUBDIRS+=	wiringpi
+endif
 
 default: all
 
 clean all:
 	set -e; for d in $(SUBDIRS); do $(MAKE) -C $$d $@; done
+
+# To find undefined symbols when implementing, for example:
+#
+# liberator:chiark-tcl> LD_LIBRARY_PATH=:adns:base:cdb:crypto:dgram:hbytes:tuntap tclsh8.3
+# % load chiark_tcl_tuntap-1.so
+# couldn't load file "chiark_tcl_tuntap-1.so": tuntap/chiark_tcl_tuntap-1.so: undefined symbol: cht_tunsocket_entries
+# %