Settings for parallel make jobs not applied

I'm having problems with switching on 2 parallel make jobs.
Assuming this problem is resolved, is it still a valid recommendation to
exclude gcc from the parallel builds?
It's the package that takes most time to build.

Section 5. RUNNING of https://wiki.linuxfromscratch.org/alfs/browser/README
mentions
that using "Optimization and parallelisation" "you'll be able to select the
number of parallel `make'  jobs".
Also the lfs book mentions export MAKEFLAGS='-j4'
https://www.linuxfromscratch.org/lfs/view/systemd/chapter04/aboutsbus.html,
but it's not clear whethet this is supported by jhalfs, even if MAKEFLAGS
appears in the jhalfs source.

Here is how I'm trying to configure make to use two jobs.
After enabling "Optimization Settings" in "make", the "jhalfs run" shows the
following, relevant output
```
...
OPTIMIZE <2>
N_PARALLEL <2>
...
***  config parameters look good ***
------------------------------------------------------------------------------

Are you happy with these settings? yes/no (no): yes

------------------------------------------------------------------------------

Loading save module...OK
Loading optimization module...OK
Loading optimization config...OK
		WARNING:

The use of build optimizations may be dangerous.

You should know what you are doing and be sure that the
optimization settings listed below are what you want.

If there are build issues or the system doesn't work as
expected, please rebuild without optimizations before
asking for support.

MAKEFLAGS: <-j2>
BLACK_LIST: <>

DEF_OPT_MODE: <noOpt>

CFLAGS: <unset>
CXXFLAGS: <unset>
LDFLAGS: <unset>
OTHER_CFLAGS: <unset>
OTHER_CXXFLAGS: <unset>
OTHER_LDFLAGS: <unset>

Overridden packages:
gcc            noOpt
grub           noOpt

------------------------------------------------------------------------------

Are you happy with these optimization settings? yes/no (no): yes

------------------------------------------------------------------------------
...
```

Despite this, the generated makefiles use -j1, except for 843-automake, which
uses -j4. These settings seem hard-coded in the lfs book XML.
```
grep j1 -r $LFS/jhalfs/lfs-commands/ | tail -1
$LFS/jhalfs/lfs-commands/chapter06/607-findutils:make -j1 DESTDIR=$LFS install
grep j1 -r $LFS/jhalfs/lfs-commands/ | wc -l
99
grep j2 -r $LFS/jhalfs/lfs-commands/
grep j4 -r $LFS/jhalfs/lfs-commands/
$LFS/jhalfs/lfs-commands/chapter08/843-automake:# make -k -j4 check >>
$TEST_LOG 2>&1 || true
```

Currently I'm using sed to adjust the selected -j1 make settings for the
packages with the longest build times.
```
cd $LFS/jhalfs
for file in $(find lfs-commands -name "*gcc*" -o -name "*glibc*");
do
echo $file && sed -i "s/make -j./make -j2/" $file
done
```

More details about the setup follows below.
I'm using the following commit of https://git.linuxfromscratch.org/jhalfs.git
(obtained with "git show --oneline --no-abbrev --shortstat")
"5156f518599b40cd1febae71614c346ff825b1d0 BLFS: remove only "a" lines for
runtime deps"
and this configuration file:
```
# Generated by Kconfiglib (https://github.com/ulfalizer/Kconfiglib)

#
# BOOK Settings
#
# BOOK_LFS is not set
BOOK_LFS_SYSD=y
# BOOK_BLFS is not set
INITSYS="systemd"
RUN_ME="./jhalfs run"
BRANCH=y
# WORKING_COPY is not set
COMMIT="trunk"
LFS_MULTILIB_NO=y
# LFS_MULTILIB_I686 is not set
# LFS_MULTILIB_X32 is not set
# LFS_MULTILIB_ALL is not set
MULTILIB="default"
BUILD_CHROOT=y
# BUILD_BOOT is not set
METHOD="chroot"
# BLFS_TOOL is not set
# CUSTOM_TOOLS is not set
# end of BOOK Settings

#
# General Settings
#
LUSER="lfs"
LGROUP="lfs"
LHOME="/home"
BUILDDIR="$LFS"
GETPKG=y
SRC_ARCHIVE="$SRC_ARCHIVE"
RETRYSRCDOWNLOAD=y
RETRYDOWNLOADCNT=20
DOWNLOADTIMEOUT=30
SERVER="http://ftp.osuosl.org"
# RUNMAKE is not set
# CLEAN is not set
# end of General Settings

#
# Build Settings
#
CONFIG_TESTS=y

#
# Test settings
#
TST_1=y
# TST_2 is not set
# end of Test settings

TEST=1
# PKGMNGT is not set
INSTALL_LOG=y
# STRIP is not set
DEL_LA_FILES=y
# NO_PROGRESS_BAR is not set
# end of Build Settings

#
# System configuration
#
# HAVE_FSTAB is not set
# CONFIG_BUILD_KERNEL is not set
# NCURSES5 is not set
TIMEZONE="GMT"
LANG="POSIX"
# FULL_LOCALE is not set
PAGE_LETTER=y
# PAGE_A4 is not set
PAGE="letter"
HOSTNAME="jhalfs"

#
# Network configuration
#
INTERFACE="eth0"
IP_ADDR="10.0.2.9"
GATEWAY="10.0.2.2"
PREFIX="24"
BROADCAST="10.0.2.255"
DOMAIN="local"
DNS1="10.0.2.3"
DNS2="8.8.8.8"
# end of Network configuration

#
# Console configuration
#
FONT="lat0-16"
KEYMAP="us"
# LOCAL is not set
# end of Console configuration
# end of System configuration

#
# Advanced Features
#
REPORT=y
SAVE_CH5=y
# COMPARE is not set
CONFIG_OPTIMIZE=y

#
# Optimization settings
#
N_PARALLEL=2
# OPT_1 is not set
OPT_2=y
# REALSBU is not set
# end of Optimization settings

OPTIMIZE=2

#
# Internal Settings (WARNING: for jhalfs developers only)
#
SCRIPT_ROOT="jhalfs"
JHALFSDIR="$BUILDDIR/$SCRIPT_ROOT"
LOGDIRBASE="logs"
LOGDIR="$JHALFSDIR/$LOGDIRBASE"
TESTLOGDIRBASE="test-logs"
TESTLOGDIR="$JHALFSDIR/$TESTLOGDIRBASE"
FILELOGDIRBASE="installed-files"
FILELOGDIR="$JHALFSDIR/$FILELOGDIRBASE"
ICALOGDIR="$LOGDIR/ICA"
MKFILE="$JHALFSDIR/Makefile"
XSL="lfs.xsl"
PKG_LST="unpacked"
# end of Internal Settings (WARNING: for jhalfs developers only)
# end of Advanced Features

# REBUILD_MAKEFILE is not set
```

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