diff --git a/doc/011-Tool_Chain-Kernel_Headers b/doc/011-Tool_Chain-Kernel_Headers
index 7ec4273..3dc8091 100755
--- a/doc/011-Tool_Chain-Kernel_Headers
+++ b/doc/011-Tool_Chain-Kernel_Headers
@@ -11,10 +11,10 @@ make mrproper
 ARCH=${MLFS_ARCH} make headers
 
 # For kernels up to 5.2.x:
-# find dest/include \( -name .install -o -name ..install.cmd \) -delete
+# find dest/include \( -name .install -o -name ..install.cmd \) -exec rm -rvf {} \;
 
 # For kernels 5.3.x and newer:
-find usr/include \( -name .install -o -name ..install.cmd \) -delete
+find usr/include \( -name .install -o -name ..install.cmd \) -exec rm -rvf {} \;
 
 # Install
 cp -rv usr/include/* /tools/include
diff --git a/doc/039-Stripping_and_Ownership b/doc/039-Stripping_and_Ownership
index ed07b77..5103892 100755
--- a/doc/039-Stripping_and_Ownership
+++ b/doc/039-Stripping_and_Ownership
@@ -1,11 +1,11 @@
-# Stripping 
-# This step is optional, but if the LFS partition 
-# is rather small, it is beneficial to learn that 
-# unnecessary items can be removed. The executables 
-# and libraries built so far contain about 70 MB 
-# of unneeded debugging symbols. 
+# Stripping
+# This step is optional, but if the LFS partition
+# is rather small, it is beneficial to learn that
+# unnecessary items can be removed. The executables
+# and libraries built so far contain about 70 MB
+# of unneeded debugging symbols.
 
-# Remove debug symbols with: 
+# Remove debug symbols with:
 strip --strip-debug /tools/lib/*
 /usr/bin/strip --strip-unneeded /tools/{,s}bin/*
 
@@ -13,31 +13,31 @@ strip --strip-debug /tools/lib/*
 rm -rf /tools/{,share}/{info,man,doc}
 
 # Remove unneeded files:
-find /tools/{lib,libexec} -name \*.la -delete
+find /tools/{lib,libexec} -name \*.la -exec rm -rvf {} \;
 
-# Changing Ownership 
-# Currently, the $MLFS/tools directory is owned by 
-# the user mlfs, a user that exists only on the 
-# host system. If the $MLFS/tools directory is kept 
-# as is, the files are owned by a user ID without 
-# a corresponding account. This is dangerous because 
-# a user account created later could get this same 
-# user ID and would own the $MLFS/tools directory 
-# and all the files therein, thus exposing these 
+# Changing Ownership
+# Currently, the $MLFS/tools directory is owned by
+# the user mlfs, a user that exists only on the
+# host system. If the $MLFS/tools directory is kept
+# as is, the files are owned by a user ID without
+# a corresponding account. This is dangerous because
+# a user account created later could get this same
+# user ID and would own the $MLFS/tools directory
+# and all the files therein, thus exposing these
 # files to possible malicious manipulation.
 
-# To avoid this issue, you could add the lfs user 
-# to the new MLFS system later when creating the 
-# /etc/passwd file, taking care to assign it the 
-# same user and group IDs as on the host system. 
+# To avoid this issue, you could add the lfs user
+# to the new MLFS system later when creating the
+# /etc/passwd file, taking care to assign it the
+# same user and group IDs as on the host system.
 
 # ************************************************
-# The commands in the remainder of this build must 
-# be performed while logged in as user root and 
-# no longer as user mlfs. Also, double check that 
+# The commands in the remainder of this build must
+# be performed while logged in as user root and
+# no longer as user mlfs. Also, double check that
 # $MLFS is set in root's environment.
 # ************************************************
 
-# Change the ownership of the $MLFS/tools directory 
+# Change the ownership of the $MLFS/tools directory
 # to user root by running the following command:
-chown -R root:root $MLFS/tools  
+chown -R root:root $MLFS/tools
diff --git a/doc/044-Final_System-Kernel_Headers b/doc/044-Final_System-Kernel_Headers
index 639f340..49f743f 100755
--- a/doc/044-Final_System-Kernel_Headers
+++ b/doc/044-Final_System-Kernel_Headers
@@ -7,8 +7,8 @@
 make mrproper
 
 # Extract headers
-# !! The recommended make target “headers_install” cannot 
-# !! be used, because it requires rsync, which is not 
+# !! The recommended make target “headers_install” cannot
+# !! be used, because it requires rsync, which is not
 # !! available in /tools. The headers are first placed in ./usr
 #
 # For kernels up to 5.2.x:
@@ -17,14 +17,14 @@ make mrproper
 # For kernels 5.3.x and newer:
 make headers
 
-# There are also some hidden files used by the kernel 
-# developers and not needed by MLFS that are removed 
+# There are also some hidden files used by the kernel
+# developers and not needed by MLFS that are removed
 # from the intermediate directory.
 # Kernels up to 5.2.x:
-# find dest/include \( -name .install -o -name ..install.cmd \) -delete
+# find dest/include \( -name .install -o -name ..install.cmd \) -exec rm -rvf {} \;
 
 # Kernels 5.3.x and newer:
-find usr/include -name '.*' -delete
+find usr/include -name '.*' -exec rm -rvf {} \;
 
 # Install Headers
 # Kernel up to 5.2.x:
diff --git a/doc/128-Final_System-Clean_up b/doc/128-Final_System-Clean_up
index d087a19..bb6507c 100644
--- a/doc/128-Final_System-Clean_up
+++ b/doc/128-Final_System-Clean_up
@@ -20,6 +20,6 @@ rm -fv /usr/lib/lib{com_err,e2p,ext2fs,ss}.a
 rm -fv /usr/lib/libltdl.a
 rm -fv /usr/lib/libfl.a
 rm -fv /usr/lib/libz.a
-find /usr/lib /usr/libexec -name \*.la -delete
+find /usr/lib /usr/libexec -name \*.la -exec rm -rvf {} \;
 
 # It is also safe to remove /tools and /cross-tools directories as they're not required anymore
diff --git a/download_sources.sh b/download_sources.sh
new file mode 100755
index 0000000..75d6b7c
--- /dev/null
+++ b/download_sources.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+# Simple shell hack to download and MD5 check source tarballs.
+# Copyright 2021: Luiz Antônio (takusuman).
+# This particular script is dual-licensed between BSD 2-Clause
+# and GPL3, at your preference.
+# n() function taken from otto-pkg's posix-alt.shi lib.
+
+# USAGE: ./download_sources.sh sources.list sources.md5sum
+
+MD5CHECK=${MD5CHECK:-YES};
+
+# Workaround to the # macro in arrays
+# which doesn't work properly in bash 4.3 for some reason.
+n(){
+	echo ${@} | tr " " "\n" | wc -l;
+}
+
+main(){
+	PARENTDIR=${PWD};
+	test ! -e src && mkdir src;
+	urls=( `cat ${1} | tr "\n" " "` );
+	n_urls=`n ${urls[*]}`;
+	cd src;
+	for (( i=0; i < ${n_urls}; i++ )){
+		printf '%s\n' "Downloading $(basename ${urls[${i}]})";
+		curl -L ${urls[${i}]} -O;
+	}
+	[ ${MD5CHECK} == 'YES' ] &&
+	md5sum -c ${2};
+	cd ${PARENTDIR};
+	return 0;
+}
+
+main "${1}" "${2}";