new: more package migrations

src/flex/.gitignore

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+.cache/
+dist/
+root/

src/flex/changes.md

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+# 2.6.4
+First version

src/flex/pkg.sh

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+# general info
+NAME="flex"
+DESC="The Fast Lexical Analyzer"
+VERSION="2.6.4"
+
+# required files
+FILES=("https://github.com/westes/flex/releases/download/v${VERSION}/flex-${VERSION}.tar.gz")
+HASHES=("2882e3179748cc9f9c23ec593d6adc8d")
+
+# install and build depends
+DEPENDS=()
+BUILD=()
+
+build(){
+  tar xf "${NAME}-${VERSION}.tar.gz"
+  cd "${NAME}-${VERSION}"
+
+  ./configure --prefix=/usr                            \
+             --docdir="/usr/share/doc/flex-${VERSION}" \
+             --disable-static
+
+  make
+  make DESTDIR="${ROOTDIR}" install
+
+  ln -sv flex   "${ROOTDIR}/usr/bin/lex"
+  ln -sv flex.1 "${ROOTDIR}/usr/share/man/man1/lex.1"
+
+  cd .. && rm -r "${NAME}-${VERSION}"
+}