Add GLib as GMT optional dependency (#1929)

BUILDING.md

@@ -48,6 +48,7 @@ Optionally install these for more capabilities within GMT:
 - [GDAL](https://www.gdal.org/) (Ability to read and write numerous grid and image formats)
 - [PCRE](https://www.pcre.org/) or PCRE2 (Regular expression support)
 - [FFTW](http:https://www.fftw.org/) single-precision (Fast FFTs, >=3.3 [not needed under macOS])
+- [GLib](https://developer.gnome.org/glib/) GTHREAD support
 - LAPACK (Fast matrix inversion [not needed under macOS])
 - BLAS (Fast matrix multiplications [not needed under macOS])
 
@@ -81,7 +82,7 @@ Install the GMT dependencies with:
  sudo apt-get install build-essential cmake libcurl4-gnutls-dev libnetcdf-dev ghostscript
 
  # Install optional dependencies
- sudo apt-get install gdal-bin libgdal-dev libfftw3-dev libpcre3-dev liblapack-dev libblas-dev
+ sudo apt-get install gdal-bin libgdal-dev libfftw3-dev libpcre3-dev liblapack-dev libblas-dev libglib2.0-dev
 
  # to enable movie-making
  sudo apt-get install graphicsmagick ffmpeg
@@ -108,7 +109,7 @@ You then can install the GMT dependencies with:
  sudo yum install cmake libcurl-devel netcdf-devel ghostscript
 
  # Install optional dependencies
- sudo yum install gdal gdal-devel pcre-devel fftw3-devel lapack-devel openblas-devel
+ sudo yum install gdal gdal-devel pcre-devel fftw3-devel lapack-devel openblas-devel glib2-devel
 
  # to enable movie-making
  # ffmpeg is provided by [rmpfusion](https://rpmfusion.org/)
@@ -133,7 +134,7 @@ Install the GMT dependencies with:
  sudo dnf install cmake libcurl-devel netcdf-devel ghostscript
 
  # Install optional dependencies
- sudo dnf install gdal gdal-devel pcre-devel fftw3-devel lapack-devel openblas-devel
+ sudo dnf install gdal gdal-devel pcre-devel fftw3-devel lapack-devel openblas-devel glib2-devel
 
  # to enable movie-making
  # ffmpeg is provided by [rmpfusion](https://rpmfusion.org/)
@@ -158,7 +159,7 @@ Install the gmt dependencies with:
  sudo pacman -S base-devel cmake libcurl-gnutls netcdf ghostscript
 
  # install optional dependencies
- sudo pacman -S gdal pcre fftw lapack openblas
+ sudo pacman -S gdal pcre fftw lapack openblas glib2
 
  # to enable movie-making
  sudo pacman -S graphicsmagick ffmpeg
@@ -203,7 +204,7 @@ For macOS with [homebrew](https://brew.sh/) installed, you can install the depen
  brew install cmake curl netcdf ghostscript
 
  # Install optional dependencies
- brew install gdal pcre2 fftw
+ brew install gdal pcre2 fftw glib
 
  # to enable movie-making
  brew install graphicsmagick ffmpeg
@@ -543,6 +544,7 @@ Files should go into directories `/usr/share/dcw-gmt/` and `/usr/share/gshhg-gmt
  - gdal
  - pcre
  - fftw
+ - glib2
  - lapack
  - openblas
  - dcw-gmt
@@ -554,6 +556,7 @@ Files should go into directories `/usr/share/dcw-gmt/` and `/usr/share/gshhg-gmt
  - gdal
  - pcre
  - fftw
+ - glib2
  - lapack
  - openblas
  - dcw-gmt