tce-load -i glib2-dev gobject-introspection-dev

cd json-glib-1.2.8

CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --disable-static --localstatedir=/var

find . -name Makefile -type f -exec sed -i 's/-O2//g' {} \;

make
sudo make install

 Json-GLib - 1.2.8 (release)

 βΆ Prefix: /usr/local

 βΆ Debug level: minimum
 βΆ Compiler flags: -g -O2 

 βΆ API reference: no
 βΆ Manual pages: no

 βΆ Install tests: 
 βΆ Build introspection data: yes
 βΆ Enable test coverage: no