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-rw-r--r--cmake/InstallHelpers.cmake2
1 files changed, 1 insertions, 1 deletions
diff --git a/cmake/InstallHelpers.cmake b/cmake/InstallHelpers.cmake
index faf980bd47..bf1ef1c0d6 100644
--- a/cmake/InstallHelpers.cmake
+++ b/cmake/InstallHelpers.cmake
@@ -22,7 +22,7 @@ function(create_install_dir_with_perms)
install(CODE
"
- if(ENV{DESTDIR})
+ if(DEFINED ENV{DESTDIR})
set(PREFIX \$ENV{DESTDIR}/\${CMAKE_INSTALL_PREFIX})
else()
set(PREFIX \${CMAKE_INSTALL_PREFIX})