Installing OpenSSH 2.3.0p1 on Solaris 7

[Lukas Ruf]

Dear all,

trying to install OpenSSH 2.3.0p1 on 
  SunOS 5.7 Generic_106541-12 sun4u sparc SUNW,Ultra-30
always leads to the result 
  ./configure 
  [...]
  checking for deflate in -lz... no
  configure: error: *** zlib missing - please install first ***

I installed zlib-1.1.3 with its default directories and I also installed
openSSL without problems.

Strange to me that on Linux 2.2.18 I installed OpenSSH 2.3.0p1 several
times already without any problem.

Probably, I do need to update the library cache, don't I ?  But how ?

Any help is greatfully appreaciated -- thanks in advance.

Lukas