jenare.. jag har ett litet problem här :

root@Linux:/home/hampan/download/centericq-4.9.8# ./configure
loading cache ./config.cache
checking for non-GNU ld... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking for a BSD compatible install... /usr/bin/ginstall -c
checking whether build environment is sane... yes
checking whether make sets ${MAKE}... no
checking for working aclocal... missing
checking for working autoconf... missing
checking for working automake... missing
checking for working autoheader... missing
checking for working makeinfo... found
checking host system type... i586-pc-linux-gnu
checking for gcc... gcc
checking whether the C compiler (gcc ) works... yes
checking whether the C compiler (gcc ) is a cross-compiler... no
checking whether we are using GNU C... yes
checking whether gcc accepts -g... yes
checking for c++... c++
checking whether the C++ compiler (c++ ) works... yes
checking whether the C++ compiler (c++ ) is a cross-compiler... no
checking whether we are using GNU C++... yes
checking whether c++ accepts -g... yes
checking how to run the C preprocessor... gcc -E
checking for ranlib... ranlib
checking for OpenSSL... found in /usr
checking for main in -lcrypto... yes
checking for main in -lssl... yes
checking how to run the C++ preprocessor... c++ -E
checking for vector... no
configure: error: You need to have the libstdc++ headers installed
root@Linux:/home/hampan/download/centericq-4.9.8#

är det nån som har några ideer?

checking whether make sets ${MAKE}... no
checking for working aclocal... missing
checking for working autoconf... missing
checking for working automake... missing
checking for working autoheader... missing

Som du ser så saknar du några saker här...
DÅ du kär Slackware 9.0 som är väldigt gammal version av Slackware så
skulle det kunna bero på att du har en för gammal version av gcc.
Jag skulle rekomendera att installera en nyare version av Slackware så som 13.1 eller Slackware 13.37