CMake can not find package

Question

I am trying to compile avro-c 1.9.1 on Ubuntu 19.04. CMake fails with

CMake Error at CMakeLists.txt:188 (message):
  libjansson >=2.3 not found

The section of CMakeLists.txt is

# Jansson JSON library
pkg_check_modules(JANSSON jansson>=2.3)
if (JANSSON_FOUND)
    set(JANSSON_PKG libjansson)
    include_directories(${JANSSON_INCLUDE_DIRS})
    link_directories(${JANSSON_LIBRARY_DIRS})
else (JANSSON_FOUND)
    message(FATAL_ERROR "libjansson >=2.3 not found")
endif (JANSSON_FOUND)

apt tells the following about the library:

$ apt list libjansson-dev
Listing... Done
libjansson-dev/disco,now 2.12-1build1 amd64 [installed]

I suspect that the string 2.12-1build1 fails to match some pattern, and thus CMake can not detect the package. I have tried to remove the version check, but that does not change anything. Now I want to simply remove the check and set the relevant variables by hand instead. I would very much appreciate if someone could point me to what to write that would set the variables appropriately.

Answer 1

Thanks @Tsyvarev for your comment. pkg-config was not installed on my system.