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OS: Linux Mint 18.3

I'm currently trying to install the latest stable release of cryptsetup. It's installed, but as usual the Synaptic version is very old (1.6.6 compared to 2.3.2).

Running ./configure as per the "INSTALL" document, I found some problems which were solved with this answer. ./configure then failed again with:

checking for json-c... no configure: error: Package requirements (json-c) were not met: No package 'json-c' 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 JSON_C_CFLAGS and JSON_C_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details.

This then led to me to this page, where I tried following the "Build instructions". I ran the git clone instruction from the directory where you find the "configure" file for cryptsetup.

The cmake command seemed to finish OK, but running ./configure again (for cryptsetup) I get the same error.

I don't understand this business of a "non-standard prefix". Can someone say how I install this json-c package to the "standard prefix"?

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You need to install the libjson-c-dev package:

apt-get install libjson-c-dev

That will provide the development headers and libraries that are needed to build cryptsetup.

If you continue to receive error messages like that, then it means that you need to install the package that's specified.

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Nasir Riley’s answer gives the correct solution to make json-c available to the cryptsetup build.

Regarding your question about “standard prefixes”, they’re the base locations where build tools (in this instance, pkg-config) look for files; in most distributions that’s /usr and /usr/local. In your case, building json-c from source would place the files in directories under /usr/local. The reason it didn’t is that you stopped too early: the cmake step doesn’t build or install anything, you need to follow the build instructions further down, with make and sudo make install.

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  • Thanks for the explanation Commented May 4, 2020 at 11:42

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