new: more package migrations

src/bc/.gitignore

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+.cache/
+dist/
+root/

src/bc/changes.md

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+# 6.7.5
+First version

src/bc/pkg.sh

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+# general info
+NAME="bc"
+DESC="Arbitrary precision numeric processing language"
+VERSION="6.7.5"
+
+# required files
+FILES=("https://github.com/gavinhoward/bc/releases/download/${VERSION}/bc-${VERSION}.tar.xz")
+HASHES=("e249b1f86f886d6fb71c15f72b65dd3d")
+
+# install and build depends
+DEPENDS=("readline")
+BUILD=()
+
+build(){
+  tar xf "${NAME}-${VERSION}.tar.xz"
+  cd "${NAME}-${VERSION}"
+
+  CC=gcc ./configure --prefix=/usr -G -O3 -r
+  make && make test
+  make DESTDIR="${ROOTDIR}" install
+
+  cd .. && rm -r "${NAME}-${VERSION}"
+}