if [[ ! -d /tmp/output/rhel-9 ]]; then
  mkdir -p /tmp/output/rhel-9
fi

# R 3.x requires PCRE1
pcre_lib='pcre2-devel'
if [[ "${R_VERSION}" =~ ^3 ]]; then
  pcre_lib='pcre-devel'
fi

# Create post-install script required for OpenBLAS.
#
# On RHEL and SUSE, we link R against the internal shared BLAS to make the
# R binaries more portable and allow users to switch BLAS implementations without
# having to recompile R. We default to OpenBLAS, but users may prefer other implementations.
# 
# Binary packages built against the shared BLAS are also more portable and may be used
# with the default R distributed by RHEL/SUSE, or other R installations using
# shared BLAS and configured with a different BLAS (such as Microsoft R Open with MKL).
# This is especially important for RSPM's binary packages.
#
# On Ubuntu/Debian, we link R against the external BLAS instead (--with-blas/--with-lapack),
# as those distributions use the alternatives system to swap BLAS libraries at runtime.
# The default R distributions on Ubuntu/Debian use the external BLAS, so we do as well
# for portability.
#
# https://cran.r-project.org/doc/manuals/r-release/R-admin.html#Shared-BLAS
cat <<EOF >> /post-install.sh
mv /opt/R/${R_VERSION}/lib/R/lib/libRblas.so /opt/R/${R_VERSION}/lib/R/lib/libRblas.so.keep
ln -s /usr/lib64/libopenblasp.so /opt/R/${R_VERSION}/lib/R/lib/libRblas.so
EOF

# Create after-remove script to remove internal BLAS, which won't be cleaned up automatically.
cat <<EOF >> /after-remove.sh
if [ -d /opt/R/${R_VERSION} ]; then
  rm -r /opt/R/${R_VERSION}
fi
EOF

fpm \
  -s dir \
  -t rpm \
  -v 1 \
  -n "R-${R_VERSION}" \
  --vendor "RStudio, PBC" \
  --url "https://www.r-project.org" \
  --description "GNU R statistical computation and graphics system" \
  --maintainer "RStudio, PBC <https://github.com/rstudio/r-builds>" \
  --license "GPLv2+" \
  --after-install /post-install.sh \
  --after-remove /after-remove.sh \
  -p /tmp/output/rhel-9/ \
  -d bzip2-devel \
  -d gcc \
  -d gcc-c++ \
  -d gcc-gfortran \
  -d libcurl-devel \
  -d libicu-devel \
  -d libSM \
  -d libtiff \
  -d libXmu \
  -d libXt \
  -d make \
  -d openblas-devel \
  -d pango \
  -d ${pcre_lib} \
  -d tcl \
  -d tk \
  -d unzip \
  -d which \
  -d xz-devel \
  -d zip \
  -d zlib-devel \
  "/opt/R/${R_VERSION}"

export PKG_FILE=$(ls /tmp/output/rhel-9/R-${R_VERSION}*.rpm | head -1)