Thanks for the explaination!
What I've currently done is create a lib directory in my project file structure (/projectRoot/lib/). In there I've added the .lib and .dll files from zlib. Then, I went into VC and did Project -> Add to Project -> Files and selected both of those files (.lib and .dll). I'm still getting the errors as mentioned above.
About the errors, they look like syntax errors in the header files themselves. Here are a few examples...
Code:
Compiling...
main.c
c:\program files\microsoft visual studio\vc98\include\ioapi.h(34) : error C2143: syntax error : missing ')' before '*'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(34) : error C2143: syntax error : missing '{' before '*'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(34) : error C2059: syntax error : ')'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(34) : error C2061: syntax error : identifier 'OF'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(34) : error C2059: syntax error : ';'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(34) : error C2146: syntax error : missing ')' before identifier 'opaque'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(35) : error C2143: syntax error : missing ')' before '*'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(35) : error C2143: syntax error : missing '{' before '*'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(35) : error C2059: syntax error : ')'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(35) : error C2061: syntax error : identifier 'OF'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(35) : error C2059: syntax error : ';'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(35) : error C2146: syntax error : missing ')' before identifier 'opaque'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(36) : error C2143: syntax error : missing ')' before '*'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(36) : error C2143: syntax error : missing '{' before '*'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(36) : error C2059: syntax error : ')'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(36) : error C2061: syntax error : identifier 'OF'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(36) : error C2059: syntax error : ';'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(36) : error C2146: syntax error : missing ')' before identifier 'opaque'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(37) : error C2061: syntax error : identifier 'OF'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(37) : error C2059: syntax error : ';'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(37) : error C2146: syntax error : missing ')' before identifier 'opaque'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(38) : error C2061: syntax error : identifier 'OF'
c:\program files\microsoft visual studio\vc98\include\ioapi.h(38) : error C2059: syntax error : ';'