diff --git a/etc/compilation.txt b/etc/compilation.txt
index 801d262f5aa..b97ba12fb9a 100644
--- a/etc/compilation.txt
+++ b/etc/compilation.txt
@@ -331,6 +331,7 @@ boost/container/detail/flat_tree.hpp:589:25:   [ skipping 5 instantiation contex
    |
    |board.h:60:21:
    |   60 | #define I(b, C) ((C).y * (b)->width + (C).x)
+  src/add.cpp:8:31: error: invalid operands of types ‘const double’ and ‘const double*’ to binary ‘operator+’
 
 
 * Guile backtrace, 2.0.11
diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
index 07974906a90..53aca7b0266 100644
--- a/lisp/progmodes/compile.el
+++ b/lisp/progmodes/compile.el
@@ -460,8 +460,9 @@ of[ \t]+\"?\\([a-zA-Z]?:?[^\":\n]+\\)\"?:" 3 2 nil (1))
        ;; non-interactive programs other than compilers (e.g. the
        ;; "jade:" entry in compilation.txt).
        (? (| (: alpha (+ (in ?. ?- alnum)) ":" (? " "))
-             ;; Skip indentation generated by GCC's -fanalyzer.
-             (: (+ " ") "|")))
+             ;; Skip indentation generated by GCC's -fanalyzer (with |),
+             ;; or two spaces from pip install (without |).
+             (: (+ " ") (? "|"))))
 
        ;; File name group.
        (group-n 1
diff --git a/test/lisp/progmodes/compile-tests.el b/test/lisp/progmodes/compile-tests.el
index 67a713857e3..caf386b4950 100644
--- a/test/lisp/progmodes/compile-tests.el
+++ b/test/lisp/progmodes/compile-tests.el
@@ -121,7 +121,8 @@
     ;; cucumber
     (cucumber "Scenario: undefined step  # features/cucumber.feature:3"
      29 nil 3 "features/cucumber.feature" error)
-    (cucumber "      /home/gusev/.rvm/foo/bar.rb:500:in `_wrap_assertion'"
+    ;; Below is from cucumber but gnu regexp is consistent and matches first.
+    (gnu "      /home/gusev/.rvm/foo/bar.rb:500:in `_wrap_assertion'"
      1 nil 500 "/home/gusev/.rvm/foo/bar.rb" error)
     ;; edg-1 edg-2
     (edg-1 "build/intel/debug/../../../struct.cpp(42): error: identifier \"foo\" is undefined"
@@ -271,6 +272,8 @@
      1 nil 27041 "{standard input}" warning)
     (gnu "boost/container/detail/flat_tree.hpp:589:25:   [ skipping 5 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]"
      1 25 589 "boost/container/detail/flat_tree.hpp" info)
+    ;; Below from pip install, running g++ to compile python extension module.
+    (gnu "  src/add.cpp:8:31: error: invalid operands of types ‘const double’ and ‘const double*’ to binary ‘operator+’" 1 31 8 "src/add.cpp" error)
     ;; Gradle/Kotlin
     (gradle-kotlin
      "e: file:///src/Test.kt:267:5 foo: bar" 4 5 267 "/src/Test.kt" error)
@@ -556,7 +559,7 @@ The test data is in `compile-tests--test-regexps-data'."
                    1 15 5 "alpha.c")))
         (compile--test-error-line test))
 
-      (should (eq compilation-num-errors-found 110))
+      (should (eq compilation-num-errors-found 111))
       (should (eq compilation-num-warnings-found 37))
       (should (eq compilation-num-infos-found 36)))))