[glib: 1/2] docs: Update some outdated paths in INSTALL.in

[Sebastian Dröge <sdroege src gnome org>]

commit b824a16fce0d10204dbbbf3cd644bcbec97d63ff
Author: Philip Withnall <pwithnall endlessos org>
Date:   Mon Jan 17 16:21:22 2022 +0000

    docs: Update some outdated paths in INSTALL.in
    
    Signed-off-by: Philip Withnall <pwithnall endlessos org>
    
    Fixes: #2579

 INSTALL.in | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/INSTALL.in b/INSTALL.in
index 12774c30e..c5b551cba 100644
--- a/INSTALL.in
+++ b/INSTALL.in
@@ -96,13 +96,10 @@ use of these flags is not tested.
 One particular detail to note, is that the architecture-dependent
 include file glibconfig.h is installed in:
 
-  $exec_prefix/lib/glib/include/
-
-if you have a version in $prefix/include, this is out of date
-and should be deleted.
+  $libdir/glib-2.0/include/
 
 .pc files for the various libraries are installed in
-$exec_prefix/lib/pkgconfig to provide information when compiling
+$libdir/pkgconfig to provide information when compiling
 other packages that depend on GLib. If you set PKG_CONFIG_PATH
 so that it points to this directory, then you can get the
 correct include flags and library flags for compiling a GLib
@@ -111,6 +108,9 @@ application with:
  pkg-config --cflags glib-2.0
  pkg-config --libs glib-2.0
 
+This is the only supported way of determining the include and library flags
+for building against GLib.
+
 
 Cross-compiling GLib
 ====================