diff --git a/.github/workflows/build-docs.yml b/.github/workflows/build-docs.yml
index ec257120cd..becb4afe08 100644
--- a/.github/workflows/build-docs.yml
+++ b/.github/workflows/build-docs.yml
@@ -8,6 +8,9 @@ on:
   push:
     branches:
       - 'master'
+  pull_request:
+    branches:
+      - '**'
 
 jobs:
   build:
diff --git a/adm/occaux.tcl b/adm/occaux.tcl
index a2c87bc5d1..5e3861a58e 100644
--- a/adm/occaux.tcl
+++ b/adm/occaux.tcl
@@ -144,20 +144,39 @@ proc OCCDoc_GetRelPath {thePathFrom thePathTo} {
 
 # Returns OCCT version string from version.cmake (if available)
 proc OCCDoc_DetectCasVersion {} {
+  # Default version in case the file is not found or readable
   set occt_ver "7.8.0"
   set occt_ver_add ""
-  set filename "[OCCDoc_GetSourceDir]/../adm/cmake/version.cmake"
-  if { [file exists $filename] } {
-    set fh [open $filename "r"]
-    set fh_loaded [read $fh]
-    close $fh
-    regexp {set\s+OCC_VERSION_MAJOR\s+([0-9]+)} $fh_loaded dummy major
-    regexp {set\s+OCC_VERSION_MINOR\s+([0-9]+)} $fh_loaded dummy minor 
-    regexp {set\s+OCC_VERSION_MAINTENANCE\s+([0-9]+)} $fh_loaded dummy maint
-    regexp {set\s+OCC_VERSION_DEVELOPMENT\s+\"([^\"]+)\"} $fh_loaded dummy occt_ver_add
-    set occt_ver "$major.$minor.$maint"
-    if { "$occt_ver_add" != "" } { set occt_ver ${occt_ver}.$occt_ver_add }
+  
+  # Construct path to version.cmake relative to script location
+  set filename "[file normalize [file dirname [info script]]/cmake/version.cmake]"
+  
+  if { [file exists $filename] && [file readable $filename] } {
+    if {[catch {
+      set fh [open $filename "r"]
+      set fh_loaded [read $fh]
+      close $fh
+      
+      # Use more robust regular expressions
+      regexp {OCC_VERSION_MAJOR\s+(\d+)} $fh_loaded -> major
+      regexp {OCC_VERSION_MINOR\s+(\d+)} $fh_loaded -> minor
+      regexp {OCC_VERSION_MAINTENANCE\s+(\d+)} $fh_loaded -> maint
+      regexp {OCC_VERSION_DEVELOPMENT\s+\"([^\"]+)\"} $fh_loaded -> occt_ver_add
+      
+      if {[info exists major] && [info exists minor] && [info exists maint]} {
+        puts "Info: Open CASCADE Technology version $major.$minor.$maint"
+        set occt_ver "$major.$minor.$maint"
+        if { [info exists occt_ver_add] && $occt_ver_add != "" } {
+          set occt_ver ${occt_ver}.$occt_ver_add
+        }
+      }
+    } err]} {
+      puts "Warning: Error reading version from $filename: $err"
+    }
+  } else {
+    puts "Warning: Version file $filename not found or not readable"
   }
+  
   return $occt_ver
 }