Version:            (using KDE KDE 3.5.6)
Installed from:    Compiled From Sources
Compiler:          gcc 3.4.6 
OS:                Solaris

I get this compile error on Solaris:

if /bin/bash ../libtool --silent --mode=compile --tag=CXX g++ -DHAVE_CONFIG_H -I. -I. -I.. -I/opt/kde/include -I/opt/qt/include   -I/gorbag/exta/cad/externals/SOLARIS/gnome2/include/glib-2.0 -I/gorbag/exta/cad/externals/SOLARIS/include -I/gorbag/exta/cad/externals/SOLARIS/gnome2/include/glib-2.0 -I/gorbag/exta/cad/externals/SOLARIS/include -I/gorbag/exta/cad/externals/SOLARIS/gnome2/include/glib-2.0 -I/gorbag/exta/cad/externals/SOLARIS/include -DQT_THREAD_SUPPORT -I/opt/kde/include  -I/gorbag/exta/cad/externals/SOLARIS/gnome2/include/glib-2.0 -I/gorbag/exta/cad/externals/SOLARIS/include -I/opt/qt/include -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS -DUSE_SOLARIS -DSVR4 -D_FILE_OFFSET_BITS=64  -Wno-long-long -Wundef -Wall -W -Wpointer-arith -DNDEBUG -DNO_DEBUG -O2 -I/opt/kde/include -I/gorbag/exta/cad/externals/SOLARIS/gnome2/include/glib-2.0 -I/gorbag/exta/cad/externals/SOLARIS/include -I/opt/qt/include -O2 -fomit-frame-pointer -DNeedVarargsPrototypes=1 -DNeedFunctionPrototypes=1 -pipe -fno-exceptions -mcpu=ultrasparc -Wno-non-virtual-dtor -fno-exceptions -fno-check-new -fno-common  -MT kgpgme.lo -MD -MP -MF ".deps/kgpgme.Tpo" \
  -c -o kgpgme.lo `test -f 'kgpgme.cpp' || echo './'`kgpgme.cpp; \
then mv -f ".deps/kgpgme.Tpo" ".deps/kgpgme.Plo"; \
else rm -f ".deps/kgpgme.Tpo"; exit 1; \
fi
kgpgme.cpp: In member function `void KGpgMe::setPassphraseCb()':
kgpgme.cpp:380: error: `setenv' was not declared in this scope

setenv is a linux extention. I believe that KDE provides an alternate implementation in libkdefakes, but there is no prototype provided.