Solaris ships with everything you need, except for the compiler. All this stuff lives in /usr/ccs/bin and /usr/ccs/lib. If you still can't find it, make sure you have the following packages installed on your system:
for tools (sccs, lex, yacc, make, nm, truss, ld, as): SUNWbtool, SUNWsprot, SUNWtoo for libraries & headers: SUNWhea, SUNWarc, SUNWlibm, SUNWlibms SUNWdfbh, SUNWcg6h, SUNWxwinc, SUNWolinc, SUNWxglh for ucb compat: SUNWsra, SUNWsrh
These packages are all on the Solaris 2.x CDs, except that some packages may only exist in some releases and not in others. Some packages may be on seperate CDs, such as the "Desktop/CDE" CD, but all are part of the Solaris "bundle".