user port commands (i.e., without "sudo") fail because of incompatible version of tcsh8.5.dylib

[allison.strom@…]

When trying to update my installation after upgrading to Yosemite, I encountered the following problem:

# port -qv installed

dyld: Library not loaded: /opt/local/libexec/macports/lib/libtcl8.5.dylib
  Referenced from: /opt/local/libexec/macports/bin/tclsh8.5
  Reason: Incompatible library version: tclsh8.5 requires version 8.5.0 or later, but libtcl8.5.dylib provides version 0.0.0
Trace/BPT trap

When I attempt

# sudo port -qv installed

however, it works. This occurs for every port command, but I am having trouble identifying the cause. The file exists, but appears not to have been installed with the most recent base (using the package installer) for Mavericks, which is perhaps the problem. However, when I try to upgrade using the source install as recommend here (​https://guide.macports.org/chunked/installing.macports.upgrade.html), I encounter the same problem after attempting 'make':

dyld: Library not loaded: /opt/local/libexec/macports/lib/libtcl8.5.dylib
  Referenced from: /opt/local/libexec/macports/bin/tclsh8.5
  Reason: Incompatible library version: tclsh8.5 requires version 8.5.0 or later, but libtcl8.5.dylib provides version 0.0.0
make[2]: *** [install-libraries] Trace/BPT trap: 5
make[1]: *** [destroot-tcllib] Error 2
make: *** [all] Error 1

[neverpanic (Clemens Lang)]

Please use WikiFormatting when posting in trac and preview your post. It seems you have DYLD_LIBRARY_PATH set in your environment, which is filtered by sudo automatically, because it is a setuid binary. You should never set DYLD_LIBRARY_PATH on OS X for regular usage. Please unset it.