fix comment

[lyx.git] / INSTALL

diff --git a/INSTALL b/INSTALL
index 5c9c4d74899a13e6c632f9d5127a7e0536b49146..63c79198b90c6c0bf18d4495d06a57e27be2ff46 100644 (file)
--- a/INSTALL
+++ b/INSTALL
@@ -55,9 +55,9 @@ Requirements
 First of all, you will need a C++11 standard conforming compiler, like g++ (at
 least 4.9, to have proper srd::regex) or clang++.
 
-LyX makes great use of the C++ Standard Template Library (STL).
-This means that gcc users will have to install the relevant libstdc++
-library to be able to compile this version of LyX.
+LyX makes great use of the C++ Standard Library. This means that gcc
+users will have to install the relevant libstdc++ library to be able
+to compile this version of LyX.
 
 For full LyX usability we suggest to use Qt 5.6 and higher, or at the
 very least Qt 5.4. It is also possible to compile against Qt 6. The
@@ -71,6 +71,10 @@ libraries. See the RELEASE-NOTES for details.
 Users of debian-based distributions are well advised to run
 'apt-get build-dep lyx' before compiling to install proper dependencies.
 
+Python 3.8 (or newer) must be installed. Python is used for many simple
+tasks that are executed by external scripts, such as the automatic
+configuration step and the import of older LyX documents with the
+lyx2lyx script (this script is called automatically when opening a file).
 
 * Other things to note
 
@@ -79,14 +83,7 @@ translations or you change the translation files themselves (po/*.po)
 files, you will need to have the GNU gettext package installed to
 compile LyX with up-to-date translations (at least gettext version
 0.16.1 is needed). You can get the latest version from:
-       ftp://ftp.gnu.org/gnu/gettext/
-
-The two following programs should be available at configuration time:
-
-  o Python (2.7 or 3.5 and newer) must be installed. Python is used for many
-    simple tasks that are executed by external scripts, such as the automatic
-    configuration step and the import of older LyX documents with the lyx2lyx
-    script (this script is called automatically when opening a file).
+       https://ftp.gnu.org/gnu/gettext/
 
 
 Creating the Makefile
@@ -107,7 +104,7 @@ flags:
     the settings in terms of various options that are described later
 
                       release   prerelease  development profiling gprof
-    optimization        -O2         -O2         -O         -O2     -O2
+    optimization        -O2         -O2         -Og        -O2     -O2
     assertions                       X           X
     stdlib-assertions                            X
     stdlib-debug
@@ -213,10 +210,11 @@ values):
 
   o --enable-optimization=VALUE enables you to set optimization to a
     higher level than the default, for example --enable-optimization=-O3.
+    Default is -Og when debugging is enabled, -O2 otherwise.
 
   o --disable-optimization - you can use this to disable compiler
     optimization of LyX. The compile may be much quicker with some
-    compilers, but LyX will run more slowly.
+    compilers, but LyX will be slower.
 
   o --enable-debug will add debug information to your binary. This
     requires a lot more disk space, but is a must if you want to try
@@ -285,4 +283,3 @@ variable, you have to compile LyX for one architecture at a time in
 the source code directory.  After you have installed LyX for one
 architecture, use `make distclean' before reconfiguring for another
 architecture.
-