macOS Issue when installing geany plugins

Question

I have been trying to install the Geany plugins since yesterday but unsuccessfully.
I am using a mac os Sierra version 10.12.6 I installed Geany 1.31 on my mac.

and here are the steps I follow to install the plugins: 1- I dowloaded the plugins folder

then on the terminal I type:

cd /Users/davidabitbol/Downloads/untitled\ folder/geany-plugins-1.31  

then

./configure

and here it does not work. this is what I get:

Package geany was not found in the pkg-config search path.
Perhaps you should add the directory containing `geany.pc'
to the PKG_CONFIG_PATH environment variable
No package 'geany' found
checking for GEANY... no
configure: error: Package requirements (geany >= 1.29) were not met:

No package 'geany' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables GEANY_CFLAGS
and GEANY_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

I can't manage to solve this issue. Any idea what should be done?

thanks