PLPlot library not found/incomplete

[hanssnah82]

Output of brew config

HOMEBREW_VERSION: 3.6.16
ORIGIN: https://github.com/Homebrew/brew
HEAD: 740f9ddcc620d4812770a0f12854ddd79c643874
Last commit: 12 days ago
Core tap ORIGIN: https://github.com/Homebrew/homebrew-core
Core tap HEAD: 5c5937c53d24283363d4b34beb1918c52a4d4d88
Core tap last commit: 2 hours ago
Core tap branch: master
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CASK_OPTS: []
HOMEBREW_DISPLAY: /private/tmp/com.apple.launchd.jLxbybrnNh/org.xquartz:0
HOMEBREW_MAKE_JOBS: 36
Homebrew Ruby: 2.6.10 => /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby
CPU: 36-core 64-bit skylake
Clang: 14.0.0 build 1400
Git: 2.37.1 => /Applications/Xcode.app/Contents/Developer/usr/bin/git
Curl: 7.85.0 => /usr/bin/curl
macOS: 13.1-x86_64
CLT: 14.2.0.0.1.1668646533
Xcode: 14.2

Output of brew doctor

Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: You have unlinked kegs in your Cellar.
Leaving kegs unlinked can lead to build-trouble and cause formulae that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
  xorgproto
  harfbuzz
  zstd

Description of issue

I just wanted to compile software from source that uses plplot (https://github.com/astromatic/scamp). However, it appears that plplot is incomplete. I already linked plplot with brew link plplot and direct the compiler to the directory containing the *h files (/usr/local/include/plplot). When I run configure, everything checks out until plplot where I get

checking for /usr/local/include/plplot/plplot.h... yes
checking for library containing c_plinit... no
configure: WARNING: PLPlot library not found/incomplete! Plotting deactivated.

I am not certain what is missing on my end and any help would be greatly appreciated :/

Relevant casks

plplot

[SMillerDev]

Well, not everything is always enabled for all formulae. I guess Scamp needs something that isn't enabled. You can check everything that's configured for PlPlot in https://github.com/Homebrew/homebrew-core/blob/master/Formula/plplot.rb