Place ICU_INSTALL_DIR on PKG_CONFIG_PATH

Author: nikic

.travis.yml

@@ -91,6 +91,7 @@ install:
     export PKG_CONFIG_PATH=$PWD:$PKG_CONFIG_PATH
   fi
 - ./bin/install-icu
+- export PKG_CONFIG_PATH=$ICU_INSTALL_DIR/lib/pkgconfig:$PKG_CONFIG_PATH
 - ./bin/install-libzip
 - ./bin/install-libsodium
 - ./bin/install-password-argon2

bin/install-icu

@@ -20,4 +20,7 @@ rm -rf $ICU_INSTALL_DIR
 make install
 popd
 
-echo "--with-icu-dir=$ICU_INSTALL_DIR" >> $TRAVIS_BUILD_DIR/default_configure_options.${RELEASE}
+# PHP >= 7.4 exclusively uses pkg-config for ICU
+if [[ $VERSION =~ ^5 || $VERSION =~ 7\.[0123] ]]; then
+    echo "--with-icu-dir=$ICU_INSTALL_DIR" >> $TRAVIS_BUILD_DIR/default_configure_options.${RELEASE}
+fi