=begin
For some systems, including Solaris 10, /bin/sh is not a POSIX shell. Certain features like the continue statement are missing from the /bin/sh shell on Solaris. Autoconf contains a macro which will set the appropriate POSIX shell for a system.

http://www.gnu.org/software/hello/manual/autoconf/The-Make-Macro-SHELL.html

The following allows ruby to be built, and more specifically, cleaned without modification on Solaris 10.

Index: Makefile.in¶

--- Makefile.in (revision 26352)
+++ Makefile.in (working copy)
@@ -1,4 +1,4 @@
-SHELL = /bin/sh
+SHELL = @SHELL@
NULLCMD = :
RUNCMD = $(SHELL)
CHDIR = @CHDIR@
=end