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--- a/src/INSTALL
+++ b/src/INSTALL
@@ -178,8 +178,8 @@
    ok). If you build on another system, and need to modify things, I would
    very much welcome patches.
 
-   Depending on the qt configuration on your system, you may have to set the
-   QTDIR and QMAKESPECS variables in your environment:
+   Depending on the Qt 3 configuration on your system, you may have to set
+   the QTDIR and QMAKESPECS variables in your environment:
 
      * QTDIR should point to the directory above the one that holds the qt
        include files (ie: if qt.h is /usr/local/qt/include/qt.h, QTDIR should
@@ -189,8 +189,11 @@
        sub-directories (ie: linux-g++).
 
    On many Linux systems, QTDIR is set by the login scripts, and QMAKESPECS
-   is not needed because there is a default link in mkspecs/. Neither should
-   be needed with Qt 4.
+   is not needed because there is a default link in mkspecs/.
+
+   Neither QTDIR nor QMAKESPECS should be needed with Qt 4, configuration
+   details are entirely determined by qmake (which is quite often installed
+   as qmake-qt4).
 
    Configure options:
 
@@ -219,6 +222,8 @@
      * --without-gui Disable the Qt interface, and auxiliary uses of X11, and
        compile the command line version.
 
+     * Of course the usual autoconf configure options, like --prefix apply.
+
    Normal procedure:
 
          cd recoll-xxx
@@ -239,10 +244,12 @@
    the source tree. This will copy the commands to prefix/bin and the sample
    configuration files, scripts and other shared data to prefix/share/recoll.
 
-   If the installation prefix given to recollinstall is different from what
-   was specified when executing configure, you will have to set the
+   If the installation prefix given to recollinstall is different from either
+   the system default or the value which was specified when executing
+   configure (as in configure --prefix /some/path), you will have to set the
    RECOLL_DATADIR environment variable to indicate where the shared data is
-   to be found.
+   to be found (ie for (ba)sh: export
+   RECOLL_DATADIR=/some/path/share/recoll).
 
    You can then proceed to configuration.
 
@@ -318,12 +325,13 @@
 
      * Section definition ([somedirname]).
 
-   Section definitions allow redefining some parameters for a directory
-   sub-tree. They stay in effect until another section definition, or the end
-   of file, is encountered. Some of the parameters used for indexing are
-   looked up hierarchically from the current directory location upwards. Not
-   all parameters can be meaningfully redefined, this is specified for each
-   in the next section.
+   Depending on the type of configuration file, section definitions either
+   separate groups of parameters or allow redefining some parameters for a
+   directory sub-tree. They stay in effect until another section definition,
+   or the end of file, is encountered. Some of the parameters used for
+   indexing are looked up hierarchically from the current directory location
+   upwards. Not all parameters can be meaningfully redefined, this is
+   specified for each in the next section.
 
    When found at the beginning of a file path, the tilde character (~) is
    expanded to the name of the user's home directory, as a shell would do.