diff -Nur a/pyproj/datadir.py b/pyproj/datadir.py
--- a/pyproj/datadir.py	2021-04-10 18:26:52.829018483 +0100
+++ b/pyproj/datadir.py	2021-04-10 18:44:59.155190614 +0100
@@ -70,7 +70,7 @@
     if _VALIDATED_PROJ_DATA is not None:
         return _VALIDATED_PROJ_DATA
     global _USER_PROJ_DATA
-    internal_datadir = Path(__file__).absolute().parent / "proj_dir" / "share" / "proj"
+    internal_datadir = Path("@proj@/share/proj")
     proj_lib_dirs = os.environ.get("PROJ_LIB", "")
     prefix_datadir = Path(sys.prefix, "share", "proj")
 
diff -Nur a/setup.py b/setup.py
--- a/setup.py	2021-04-10 18:26:52.817018512 +0100
+++ b/setup.py	2021-04-10 18:46:01.652324424 +0100
@@ -11,7 +11,7 @@
 PROJ_MIN_VERSION = parse_version("7.2.0")
 CURRENT_FILE_PATH = Path(__file__).absolute().parent
 BASE_INTERNAL_PROJ_DIR = Path("proj_dir")
-INTERNAL_PROJ_DIR = CURRENT_FILE_PATH / "pyproj" / BASE_INTERNAL_PROJ_DIR
+INTERNAL_PROJ_DIR = Path("@proj@")
 
 
 def get_proj_version(proj_dir: Path) -> str:
@@ -150,7 +150,7 @@
     # By default we'll try to get options PROJ_DIR or the local version of proj
     proj_dir = get_proj_dir()
     library_dirs = get_proj_libdirs(proj_dir)
-    include_dirs = get_proj_incdirs(proj_dir)
+    include_dirs = get_proj_incdirs(Path("@projdev@"))
 
     proj_version = get_proj_version(proj_dir)
     check_proj_version(proj_version)
diff -Nur a/test/conftest.py b/test/conftest.py
--- a/test/conftest.py	2021-04-10 18:26:52.831018478 +0100
+++ b/test/conftest.py	2021-04-10 18:37:01.605682432 +0100
@@ -2,6 +2,7 @@
 from contextlib import contextmanager
 from distutils.version import LooseVersion
 from pathlib import Path
+import stat
 
 import pyproj
 from pyproj.datadir import get_data_dir, get_user_data_dir, set_data_dir
diff -Nur a/test/test_cli.py b/test/test_cli.py
--- a/test/test_cli.py	2021-04-10 18:26:52.831018478 +0100
+++ b/test/test_cli.py	2021-04-10 22:17:04.665088162 +0100
@@ -14,7 +14,7 @@
 from test.conftest import grids_available, proj_env, tmp_chdir
 
 PYPROJ_CLI_ENDPONTS = pytest.mark.parametrize(
-    "input_command", [["pyproj"], [sys.executable, "-m", "pyproj"]]
+    "input_command", [[sys.executable, "-m", "pyproj"]]
 )