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#!/bin/bash
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# Anticonf (tm) script by Jeroen Ooms (2017)
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# This script will query 'pkg-config' for the required cflags and ldflags.
# If pkg-config is unavailable or does not find the library, try setting
# INCLUDE_DIR and LIB_DIR manually via e.g:
# R CMD INSTALL --configure-vars='INCLUDE_DIR=/.../include LIB_DIR=/.../lib'

# Library settings
PKG_CONFIG_NAME="redland"
PKG_DEB_NAME="librdf0-dev"
PKG_RPM_NAME="redland-devel"
PKG_BREW_NAME="redland"
PKG_TEST_HEADER="<redland.h>"
PKG_LIBS="-lrdf"
PKG_CFLAGS=""

# Use pkg-config if available
if [ $(command -v pkg-config) ]; then
  PKGCONFIG_CFLAGS=$(pkg-config --cflags --silence-errors ${PKG_CONFIG_NAME})
  PKGCONFIG_LIBS=$(pkg-config --libs ${PKG_CONFIG_NAME})
fi

# Note that cflags may be empty in case of success
if [ "$INCLUDE_DIR" ] || [ "$LIB_DIR" ]; then
  echo "Found INCLUDE_DIR and/or LIB_DIR!"
  PKG_CFLAGS="-I$INCLUDE_DIR $PKG_CFLAGS"
  PKG_LIBS="-L$LIB_DIR $PKG_LIBS"
elif [ "$PKGCONFIG_CFLAGS" ] || [ "$PKGCONFIG_LIBS" ]; then
  echo "Found pkg-config cflags and libs!"
  PKG_CFLAGS=${PKGCONFIG_CFLAGS}
  PKG_LIBS=${PKGCONFIG_LIBS}
elif [[ "$OSTYPE" == "darwin"* ]]; then
  if [ $(command -v brew) ]; then
    BREWDIR=$(brew --prefix)
  else
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    curl -sfL "https://jeroen.github.io/autobrew/$PKG_BREW_NAME" > autobrew
    source autobrew 
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  fi
  PKG_CFLAGS=$($BREWDIR/opt/pkg-config/bin/pkg-config --cflags ${PKG_CONFIG_NAME})
  PKG_LIBS=$($BREWDIR/opt/pkg-config/bin/pkg-config --libs --static ${PKG_CONFIG_NAME})
fi

# For debugging
echo "Using PKG_CFLAGS=$PKG_CFLAGS"
echo "Using PKG_LIBS=$PKG_LIBS"

# Find compiler
CC=$(${R_HOME}/bin/R CMD config CC)
CFLAGS=$(${R_HOME}/bin/R CMD config CFLAGS)
CPPFLAGS=$(${R_HOME}/bin/R CMD config CPPFLAGS)

# Test configuration
echo "#include $PKG_TEST_HEADER" | ${CC} ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} -E -xc - >/dev/null 2>&1 || R_CONFIG_ERROR=1;

# Customize the error
if [ $R_CONFIG_ERROR ]; then
  echo "------------------------- ANTICONF ERROR ---------------------------"
  echo "Configuration failed because $PKG_CONFIG_NAME was not found. Try installing:"
  echo " * deb: $PKG_DEB_NAME (Debian, Ubuntu, etc)"
  echo " * rpm: $PKG_RPM_NAME (Fedora, EPEL)"
  echo " * brew: $PKG_BREW_NAME (OSX)"
  echo "If $PKG_CONFIG_NAME is already installed, check that 'pkg-config' is in your"
  echo "PATH and PKG_CONFIG_PATH contains a $PKG_CONFIG_NAME.pc file. If pkg-config"
  echo "is unavailable you can set INCLUDE_DIR and LIB_DIR manually via:"
  echo "R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'"
  echo "--------------------------------------------------------------------"
  exit 1;
fi

# Write to Makevars
sed -e "s|@cflags@|$PKG_CFLAGS|" -e "s|@libs@|$PKG_LIBS|" src/Makevars.in > src/Makevars

# Success
exit 0