try adding configure from openssl R package

src/Makevars.win

@@ -3,7 +3,7 @@ TARGET = $(subst 64,x86_64,$(subst 32,i686,$(WIN)))-pc-windows-gnu
 TARGET_DIR = ./rust/target
 LIBDIR = $(TARGET_DIR)/$(TARGET)/release
 STATLIB = $(LIBDIR)/libarcgisplaces.a
-PKG_LIBS = -L$(LIBDIR) -larcgisplaces -lws2_32 -ladvapi32 -luserenv -lbcrypt -lntdll -lcrypt32 -lsspi
+PKG_LIBS = -L$(LIBDIR) -larcgisplaces -lws2_32 -ladvapi32 -luserenv -lbcrypt -lntdll -lcrypt32 -lssl
 
 all: C_clean
 

src/configure

@@ -0,0 +1,110 @@
+# Anticonf (tm) script by Jeroen Ooms (2023)
+# 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="openssl"
+PKG_DEB_NAME="libssl-dev"
+PKG_RPM_NAME="openssl-devel"
+PKG_CSW_NAME="libssl_dev"
+PKG_BREW_NAME="openssl"
+PKG_TEST_FILE="tools/version.c"
+PKG_LIBS="-lssl -lcrypto"
+PKG_CFLAGS=""
+
+# Build against a specific openssl version
+# export PKG_CONFIG_PATH="/usr/local/opt/[email protected]/lib/pkgconfig"
+
+# On MacOS we avoid legacy versions of openssl
+if [ `uname` = "Darwin" ]; then
+MINVERSION="--atleast-version=3"
+fi
+
+# Use pkg-config if available
+pkg-config ${PKG_CONFIG_NAME} ${MINVERSION} 2>/dev/null
+if [ $? -eq 0 ]; then
+  PKGCONFIG_CFLAGS=`pkg-config --cflags ${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=${PKGCONFIG_LIBS}
+elif [ `uname` = "Darwin" ]; then
+  test ! "$CI" && brew --version 2>/dev/null
+  if [ $? -eq 0 ]; then
+    BREWDIR=`brew --prefix`
+    PKG_CFLAGS="-I$BREWDIR/opt/openssl/include"
+    PKG_LIBS="-L$BREWDIR/opt/openssl/lib $PKG_LIBS"
+  else
+    curl -sfL "https://autobrew.github.io/scripts/$PKG_BREW_NAME" > autobrew
+    . ./autobrew
+  fi
+fi
+
+# Find compiler
+CC=`${R_HOME}/bin/R CMD config CC`
+CFLAGS=`${R_HOME}/bin/R CMD config CFLAGS`
+CPPFLAGS=`${R_HOME}/bin/R CMD config CPPFLAGS`
+
+# For debugging
+echo "Using PKG_CFLAGS=$PKG_CFLAGS"
+
+# Test configuration
+${CC} ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} -E ${PKG_TEST_FILE} >/dev/null 2>configure.log
+
+# Customize the error
+if [ $? -ne 0 ]; then
+  echo "--------------------------- [ANTICONF] --------------------------------"
+  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, CentOS, RHEL)"
+  echo " * csw: $PKG_CSW_NAME (Solaris)"
+  echo " * brew: $PKG_BREW_NAME (Mac OSX)"
+  echo "If $PKG_CONFIG_NAME is already installed, check that 'pkg-config' is in your"
+  echo "PATH and PKG_CONFIG_PATH contains a $PKG_CONFIG_NAME.pc file. If pkg-config"
+  echo "is unavailable you can set INCLUDE_DIR and LIB_DIR manually via:"
+  echo "R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'"
+  echo "-------------------------- [ERROR MESSAGE] ---------------------------"
+  cat configure.log
+  echo "--------------------------------------------------------------------"
+  exit 1
+fi
+
+# Try to link against the correct OpenSSL version
+if [ -z "$AUTOBREW" ]; then
+SONAME=`${CC} -E ${PKG_CFLAGS} src/tests/soname.h | grep 'echo' | sh | xargs`
+if [ "$SONAME" ]; then
+if [ `uname` = "Darwin" ]; then
+  PKG_LIBS_VERSIONED=`echo "${PKG_LIBS}" | sed "s/-lssl/-lssl.${SONAME}/" | sed "s/-lcrypto/-lcrypto.${SONAME}/"`
+else
+  PKG_LIBS_VERSIONED=`echo "${PKG_LIBS}" | sed "s/-lssl/-l:libssl.so.${SONAME}/" | sed "s/-lcrypto/-l:libcrypto.so.${SONAME}/"`
+fi
+
+# Test if versioned linking works
+${CC} ${PKG_CFLAGS} src/tests/main.c ${PKG_LIBS_VERSIONED} -o src/main.exe 2>/dev/null
+if [ $? -eq 0 ]; then PKG_LIBS="${PKG_LIBS_VERSIONED}"; fi
+
+# Suppress opensslv3 warnings for now
+if [ "$SONAME" = "3" ]; then
+PKG_CFLAGS="$PKG_CFLAGS -DOPENSSL_SUPPRESS_DEPRECATED"
+fi
+
+fi #SONAME
+fi #AUTOBREW
+
+echo "Using PKG_LIBS=$PKG_LIBS"
+
+# Write to Makevars
+sed -e "s|@cflags@|$PKG_CFLAGS|" -e "s|@libs@|$PKG_LIBS|" src/Makevars.in > src/Makevars
+
+# Success
+exit 0