new: migrate even more packages

src/gawk/.gitignore

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+.cache/
+dist/
+root/

src/gawk/changes.md

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+# 5.3.0
+First version

src/gawk/pkg.sh

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+# general info
+NAME="gawk"
+DESC="GNU awk"
+VERSION="5.3.0"
+
+# required files
+FILES=("https://ftp.gnu.org/gnu/gawk/gawk-${VERSION}.tar.xz")
+HASHES=("97c5a7d83f91a7e1b2035ebbe6ac7abd")
+
+# install and build depends
+DEPENDS=("glibc" "mpfr" "bash")
+BUILD=()
+
+build(){
+  tar xf "${NAME}-${VERSION}.tar.xz"
+  cd "${NAME}-${VERSION}"
+
+  sed -i 's/extras//' Makefile.in
+  ./configure --prefix=/usr \
+            --host=$LFS_TGT \
+            --build=$(build-aux/config.guess)
+  make && make DESTDIR="${ROOTDIR}" install
+
+  cd .. && rm -r "${NAME}-${VERSION}"
+}