Update of Install documentation

It is pointed out that it is mandatory to set the variables
"BLACS_LDFLAGS" and "BLACS_FCFLAGS" at build time.

Furthermore, it is clarified how to set individual optimization
flags at build time

ELPA_2011.12/INSTALL

@@ -15,10 +15,11 @@ The configure installation is best done in four steps
    linkline with the variables "BLACS_LDFLAGS" and "BLACS_FCFLAGS". 
    You can either specify your own builds of lapack/blacs/scalapack
    or use specialized Vendor packages, e.g. if available you can use 
-   Intel's MKL
+   Intel's MKL. If you do not set these variables ELPA will not be
+   build!
 
-   Please set the optimisation that you would like with the
-   variable "OPT_FCFLAGS", e.g. OPT_FCFLAGS="-O3 -xAVX"
+   Please set the further optimisation that you would like with the
+   variable "FCFLAGS", "CFLAGS", and "CXXFLAGS", e.g. FCFLAGS="-O3 -xAVX"
 
    Check the available options with "configure --help". 
    If available you can e.g. choose especially optimized elpa kernels

ELPA_2011.12/Makefile.am

 ACLOCAL_AMFLAGS = ${ACLOCAL_FLAGS} -I m4
 
 AM_FCFLAGS = @AM_FCFLAGS@ @FC_MODINC@modules @FC_MODOUT@modules 
-#@OPT_FCFLAGS@
+
 AM_LDFLAGS = @AM_LDFLAGS@ @BLACS_LDFLAGS@
 
 BLACS_LDFLAGS = @BLACS_LDFLAGS@

ELPA_2011.12/Makefile.in

@@ -181,7 +181,6 @@ distcleancheck_listfiles = find . -type f -print
 ACLOCAL = @ACLOCAL@
 AMTAR = @AMTAR@
 AM_FCFLAGS = @AM_FCFLAGS@ @FC_MODINC@modules @FC_MODOUT@modules 
-#@OPT_FCFLAGS@
 AM_LDFLAGS = @AM_LDFLAGS@ @BLACS_LDFLAGS@
 AR = @AR@
 AUTOCONF = @AUTOCONF@

ELPA_2011.12/configure

@@ -15530,8 +15530,6 @@ ac_compiler_gnu=$ac_cv_fc_compiler_gnu
-#AC_SUBST(OPT_FCFLAGS)
-
 mkdir modules
 ac_config_files="$ac_config_files Makefile elpa.pc:elpa.pc.in"

ELPA_2011.12/configure.ac

@@ -172,8 +172,6 @@ AC_SUBST([FC_MODOUT])
 AC_SUBST(BLACS_LDFLAGS)
 AC_SUBST(BLACS_FCFLAGS)
 
-#AC_SUBST(OPT_FCFLAGS)
-
 mkdir modules
 
 AC_CONFIG_FILES([

ELPA_2013.08/INSTALL

@@ -35,10 +35,12 @@ The configure installation is best done in four steps
    linkline with the variables "BLACS_LDFLAGS" and "BLACS_FCFLAGS". 
    You can either specify your own builds of lapack/blacs/scalapack
    or use specialized Vendor packages, e.g. if available you can use 
-   Intel's MKL.
+   Intel's MKL. If you do not set these variables ELPA will not be
+   build!
+
 
    Please set the optimisation that you would like with the
-   variable "OPT_FCFLAGS", e.g. OPT_FCFLAGS="-O3 -xAVX".
+   variable "FCFLAGS", "CFLAGS", and "CXXFLAGS", e.g. FCFLAGS="-O3 -xAVX".
    For some elpa2-kernels, it is MANDATORY to set a few options,
    please see "./src/elpa2_kernels/README_elpa2_kernels.txt".
 

ELPA_2013.08/configure

@@ -19759,8 +19759,6 @@ ac_compiler_gnu=$ac_cv_fc_compiler_gnu
-#AC_SUBST(OPT_FCFLAGS)
-
 mkdir modules
 #gl_VISIBILITY

ELPA_2013.08/configure.ac

@@ -231,8 +231,6 @@ AC_SUBST([FC_MODOUT])
 AC_SUBST(BLACS_LDFLAGS)
 AC_SUBST(BLACS_FCFLAGS)
 
-#AC_SUBST(OPT_FCFLAGS)
-
 mkdir modules
 
 #gl_VISIBILITY