Package libczmq was not found in the pkg-config search path.

[shiyong1989]

go build -tags 'goczmq' main.go

pkg-config --cflags -- libczmq libzmq libsodium

Package libczmq was not found in the pkg-config search path.
Perhaps you should add the directory containing `libczmq.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libczmq' found
pkg-config: exit status 1

vim /etc/profile
KG_CONFIG_PATH=/usr/local/lib/pkgconfig:/opt/code/goProjects/libsodium-stable
LD_LIBRARY_PATH=/usr/local/lib

[root@sy czmq]# ll /usr/local/lib/pkgconfig
total 12
-rw-r--r-- 1 root root 959 Apr 1 10:50 libczmq.pc
-rw-r--r-- 1 root root 267 Apr 1 09:26 libsodium.pc
-rw-r--r-- 1 root root 290 Apr 1 10:47 libzmq.pc

[root@sy czmq]# ll /usr/local/lib
total 61972
-rw-r--r-- 1 root root 5394616 Apr 1 10:50 libczmq.a
-rwxr-xr-x 1 root root 1011 Apr 1 10:50 libczmq.la
lrwxrwxrwx 1 root root 16 Apr 1 10:50 libczmq.so -> libczmq.so.4.2.2
lrwxrwxrwx 1 root root 16 Apr 1 10:50 libczmq.so.4 -> libczmq.so.4.2.2
-rwxr-xr-x 1 root root 2387528 Apr 1 10:50 libczmq.so.4.2.2
-rw-r--r-- 1 root root 4051946 Apr 1 09:26 libsodium.a
-rwxr-xr-x 1 root root 953 Apr 1 09:26 libsodium.la
lrwxrwxrwx 1 root root 19 Apr 1 09:26 libsodium.so -> libsodium.so.23.3.0
lrwxrwxrwx 1 root root 19 Apr 1 09:26 libsodium.so.23 -> libsodium.so.23.3.0
-rwxr-xr-x 1 root root 2579344 Apr 1 09:26 libsodium.so.23.3.0
-rw-r--r-- 1 root root 36762758 Apr 1 10:47 libzmq.a
-rwxr-xr-x 1 root root 931 Apr 1 10:47 libzmq.la
lrwxrwxrwx 1 root root 15 Apr 1 10:47 libzmq.so -> libzmq.so.5.2.5
lrwxrwxrwx 1 root root 15 Apr 1 10:47 libzmq.so.5 -> libzmq.so.5.2.5
-rwxr-xr-x 1 root root 12258384 Apr 1 10:47 libzmq.so.5.2.5
drwxr-xr-x 3 root root 18 Feb 25 17:59 node_modules
drwxr-xr-x 2 root root 61 Apr 1 10:50 pkgconfig
drwxr-xr-x. 3 root root 27 May 21 2021 python3.6

Where is wrong?

[nubunto]

you need to install libsodium, libzmq and czmq, which are mentioned here but that's not mentioned explicitly.