5.7.8 USE_* section:

• Remove variables that are described later in Chapter 6 from the table
• Add a paragraph with references to relevant Chapter 6 sections

5.14 Building mechanisms

• Move this section into Chapter 6 and merge with Section 6.5 about autotools

6.5 Using automake, autoconf, and libtool

• Move after Section 6.2 Ports with distribution restrictions
• Rename to Building mechanisms
• Integrate content from Section 5.14 and 5.7.8
• Split into subsections:
  • make, gmake, and imake: 5.7.8 text on gmake, 5.14 text on imake, ALL_TARGET
  • configure script: 5.14 text on configure, new text
  • autoconf: split old table from 6.5 and add some introductory text
  • automake: split old table from 6.5 and add some introductory text
  • libtool: split old table from 6.5, add text about what libtool is, mention USE_INC_LIBTOOL_VER, and interoperability problems with USE_GCC
• Change section id from using-automake to using-autotools

Approved by: keramida (mentor)