heres all the zlib packages you must download using the cygwin setup in order to do the "make" command and proceed (it's right here in the link at the end of my comment), I have confirmed it all works out great!
I Know this will help all! I just continued to trial and error with cygwin on windows 10 64 bit to emulate n64 via project64 x64 because I have the latest gliden64 dev x64 plugin release and also azimers hle audio plugin x64 but i was always unable to load the 100+ hires texture packs I downloaded from Gaming Revived's discord channel's provided links because I needed a x64 version of mupenplus RSP plugin and I was never able to ever find one no matter what I tried, only x86. The hires texture packs are all half and half (50% .htc and 50% .hts) and I really needed to find the correct way to continue following the provided guide in order to convert .htc and hopefully .hts to hires texture pack 'FOLDERS' and I'm on the final steps trying to convert one pack, Banjo Tooie.htc I'm on the step of just about being finished converting the .bmp's to .png's and then deleting the .bmp's and hopefully get it to load with the folder, I already know the names the folders need to be named because it says it right in the .htc/.hts file..Man, I feel so overjoyed that I finally got around that"no zlib development libraries found" error which would prevent me from creating the .gliden64_cache_extract.exe file which is just awesome and I felt like I just had to share it with everyone and anyone who happens to be wanting to achieve the same thing we are following this guide for, it's great!
You're welcome.. UPDATE: JUST FINISHED THE TUTORIAL ON THE BANJO TOOIE hires texture pack and it worked out flawlessly with project64 latest dev x64 build you can get x64 and other neat tools and emulators from
http://www.emucr.com/ and the x64 version of project64 with the hires textures and reshade enabled at 8k resolution 60Hz in full screen, no lag whatsoever! better performance than the standard x86 releases whether stable or dev from the project64 website. I own an intel i9 9960X oc@ 5.1 (16 cores/32 threads), 64 GB DDR4 RAM oc@ 3600MHz and an EVGA geforce RTX 3090 FTW3 ULTRA GAMING gpu oc@ +100MHz on the core clock (thats all i can do with it using the evga precision x1 oc application) the tutorial was absolutely perfect!!
LINK TO ZLIB PACKAGE NAMES TO DOWNLOAD VIA CYGWIN SETUP: