INSTALL-CMAKE.md: drop two obsolete sections

Follow-up to 89043ba90689418a115e967633e261139b48ce23 #20407

Closes #21761

diff --git a/docs/INSTALL-CMAKE.md b/docs/INSTALL-CMAKE.md
index a84faf72f20926c497bdf0863e1efb2ea1841f75..e07ec455dad8506a6fdf0f61fe7e58874ef04c03 100644 (file)
--- a/docs/INSTALL-CMAKE.md
+++ b/docs/INSTALL-CMAKE.md
@@ -103,16 +103,6 @@ arguments in the build.
 
 Building statically is not for the faint of heart.
 
-### Fallback for CMake before version 3.13
-
-CMake before version 3.13 does not support the `--build` option. In that
-case, you have to `cd` to the build directory and use the building tool that
-corresponds to the build files that CMake generated for you. This example
-assumes that CMake generates `Makefile`:
-
-    $ cd ../curl-build
-    $ make
-
 # Testing
 
 (The test suite does not yet work with the cmake build)
@@ -129,16 +119,6 @@ to set a custom install prefix for curl, set
 [`CMAKE_INSTALL_PREFIX`](https://cmake.org/cmake/help/latest/variable/CMAKE_INSTALL_PREFIX.html)
 when configuring the CMake build.
 
-### Fallback for CMake before version 3.15
-
-CMake before version 3.15 does not support the `--install` option. In that
-case, you have to `cd` to the build directory and use the building tool that
-corresponds to the build files that CMake generated for you. This example
-assumes that CMake generates `Makefile`:
-
-    $ cd ../curl-build
-    $ make install
-
 # CMake usage
 
 This section describes how to locate and use curl/libcurl from CMake-based