It no longer works to create the "build" directory and then build
separate optimized and debug versions. As confirmed in IRC with sm
and egh, the former instructions resulted in an error:
$ mkdir build
$ ./acprep opt make
make: *** No targets specified and no makefile found. Stop.
acprep: ERROR: Execution failed: make
$ ./acprep debug make
make: *** No targets specified and no makefile found. Stop.
acprep: ERROR: Execution failed: make
Maybe there's a fix for this, but I don't know what it is, so this
commit just makes the build instructions work for the common case.
Give an early pointer to where to look if 'acprep update' fails.
Clarify a few things in the first section.
Give sections clearer headers, so they can be more easily referred to.
Add a FAQ entry about what to do if './acprep update' gives errors.
Update FAQ entry about MPFR library to refer to above new entry.
Debian squeeze, which is currently the stable distribution at the time of
this commit, has both a Boost and a CMake that is too old for Ledger.
This FAQ entry explains how to build your own Boost and CMake for use with
Ledger, and the exact commands to type to build and install each, and then
configure, build and install Ledger against those new versions.
