Solaris9 : netinet/ip.h: present but cannot be compiled

[Bryan Hodgson]

Amanda's been in use here since at least 1996.  v2.30
at present.  Looking to migrate to new hardware and a
current version of amanda.

Solaris9, ultra, current patches, sfw's gcc 2.95.3 
(I'm building static only), amanda 2.4.4p1.  And the
same problem occurs on Solaris8.  I note that both
are using the /usr/ccs/bin/ld linker, which is evidently
the built-in behavior for the sfw compiler.

During confgiure the libtool portion says:

creating libtool
<snip>
checking for netdb.h... yes
checking netinet/in_systm.h usability... yes
checking netinet/in_systm.h presence... yes
checking for netinet/in_systm.h... yes
checking netinet/ip.h usability... no
checking netinet/ip.h presence... yes
configure: WARNING: netinet/ip.h: present but cannot be compiled
configure: WARNING: netinet/ip.h: check for missing prerequisite
headers?
configure: WARNING: netinet/ip.h: proceeding with the preprocessor's
result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for netinet/ip.h... yes
<snip>

I haven't yet tried running the results, but (not finding anything
on this subject in the archives) thought I'd check whether others
have noted this issue, whether it is an actual problem, and whether
there is a straight-forward work-around.

Bryan