Improve Readme.

GitOrigin-RevId: 55d9ac20bde93220befaea33e17519bd0160e9c0

README.md

@@ -78,15 +78,18 @@ cmake -DCMAKE_BUILD_TYPE=Release -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl/ ..
 
 <a name="windows"></a>
 #### Windows
+* Download and install Microsoft Visual Studio 2015 or later.
 * Download and install [gperf](https://sourceforge.net/projects/gnuwin32/files/gperf/3.0.1/). Add the path to gperf.exe to the PATH environment variable.
 * Install [vcpkg](https://github.com/Microsoft/vcpkg#quick-start).
 * Run the following commands to install `TDLib` dependencies using vcpkg:
 ```
-C:\src\vcpkg> .\vcpkg.exe install openssl:x64-windows openssl:x86-windows zlib:x64-windows zlib:x86-windows
+cd <path to vcpkg>
+.\vcpkg.exe install openssl:x64-windows openssl:x86-windows zlib:x64-windows zlib:x86-windows
 ```
+* Download and install [cmake](https://cmake.org/download/); choose "Add CMake to the system PATH" option while installing.
 * Build `TDLib` with CMake as explained in [building](#building), but instead of `cmake -DCMAKE_BUILD_TYPE=Release ..` use
 ```
-cmake -DCMAKE_TOOLCHAIN_FILE=C:\src\vcpkg\scripts\buildsystems\vcpkg.cmake ..
+cmake -DCMAKE_TOOLCHAIN_FILE=<path to vcpkg>\scripts\buildsystems\vcpkg.cmake ..
 ```
 
 To build 64-bit `TDLib` using MSVC, you will need to additionally specify parameter `-A x64` to CMake.

example/csharp/README.md

@@ -5,11 +5,12 @@ This is an example of building TDLib with `C++/CLI` support and an example of TD
 ## Building TDLib
 
 * Download and install Microsoft Visual Studio 2015 or later.
-* Download and install [CMake](https://cmake.org/download/).
+* Download and install [CMake](https://cmake.org/download/); choose "Add CMake to the system PATH" option while installing.
 * Install [vcpkg](https://github.com/Microsoft/vcpkg#quick-start) or update it to the latest version using `vcpkg update` and following received instructions.
 * Install `zlib` and `openssl` for using `vcpkg`:
 ```
-C:\src\vcpkg> .\vcpkg.exe install openssl:x64-windows openssl:x86-windows zlib:x64-windows zlib:x86-windows
+cd <path to vcpkg>
+.\vcpkg.exe install openssl:x64-windows openssl:x86-windows zlib:x64-windows zlib:x86-windows
 ```
 * (Optional. For XML documentation generation.) Download [PHP](https://windows.php.net/download#php-7.2). Add the path to php.exe to the PATH environment variable.
 * Download and install [gperf](https://sourceforge.net/projects/gnuwin32/files/gperf/3.0.1/). Add the path to gperf.exe to the PATH environment variable.
@@ -18,7 +19,7 @@ C:\src\vcpkg> .\vcpkg.exe install openssl:x64-windows openssl:x86-windows zlib:x
 cd <path to TDLib sources>/example/csharp
 mkdir build
 cd build
-cmake -DTD_ENABLE_DOTNET=ON -DCMAKE_TOOLCHAIN_FILE=C:\src\vcpkg\scripts\buildsystems\vcpkg.cmake ../../..
+cmake -DTD_ENABLE_DOTNET=ON -DCMAKE_TOOLCHAIN_FILE=<path to vcpkg>\scripts\buildsystems\vcpkg.cmake ../../..
 cmake --build . --config Release
 cmake --build . --config Debug
 ```

example/uwp/README.md

@@ -9,15 +9,16 @@ This is an example of building TDLib SDK for Universal Windows Platform and an e
 * Install [vcpkg](https://github.com/Microsoft/vcpkg#quick-start) or update it to the latest version using `vcpkg update` and following received instructions.
 * Install `zlib` and `openssl` for all UWP architectures using `vcpkg`:
 ```
-C:\src\vcpkg> .\vcpkg.exe install openssl:arm-uwp openssl:x64-uwp openssl:x86-uwp zlib:arm-uwp zlib:x64-uwp zlib:x86-uwp
+cd <path to vcpkg>
+.\vcpkg.exe install openssl:arm-uwp openssl:x64-uwp openssl:x86-uwp zlib:arm-uwp zlib:x64-uwp zlib:x86-uwp
 ```
 * (Optional. For XML documentation generation.) Download [PHP](https://windows.php.net/download#php-7.2). Add the path to php.exe to the PATH environment variable.
 * Download and install [gperf](https://sourceforge.net/projects/gnuwin32/files/gperf/3.0.1/). Add the path to gperf.exe to the PATH environment variable.
 * Download and install [7-Zip](http://www.7-zip.org/download.html) archiver, which is used by the `build.ps1` script to create a Telegram.Td.UWP Visual Studio Extension. Add the path to 7z.exe to the PATH environment variable.
   Alternatively `build.ps1` supports compressing using [WinRAR](https://en.wikipedia.org/wiki/WinRAR) with option `-compress winrar` and compressing using [zip](http://gnuwin32.sourceforge.net/packages/zip.htm) with `-compress zip`.
-* Build `TDLib` using provided `build.ps1` script (TDLib should be built 6 times for multiple platforms in Debug and Release configurations, so it make take few hours). Pass path to vcpkg.exe as `-vcpkg-root` argument:
+* Build `TDLib` using provided `build.ps1` script (TDLib should be built 6 times for multiple platforms in Debug and Release configurations, so it make take few hours). Pass path to vcpkg.exe as `-vcpkg-root` argument, for example:
 ```
-powershell -ExecutionPolicy ByPass .\build.ps1 -vcpkg_root C:\src\vcpkg
+powershell -ExecutionPolicy ByPass .\build.ps1 -vcpkg_root C:\vcpkg
 ```
 If you need to restart the build from scratch, call `.\build.ps1 -mode clean` first.
 * Install Visual Studio Extension "TDLib for Universal Windows Platform" located at `build-uwp\vsix\tdlib.vsix`, which was created on the previous step by `build.ps1` script.

tdutils/generate/CMakeLists.txt

@@ -19,7 +19,7 @@ add_custom_target(tdmime_auto DEPENDS ${TDMIME_SOURCE})
 if (NOT CMAKE_CROSSCOMPILING)
   find_program(GPERF_EXECUTABLE gperf)
   if (NOT GPERF_EXECUTABLE)
-    message(FATAL_ERROR "Could NOT find gperf. Path to gperf needs to be specified manually, i.e. 'cmake -DGPERF_EXECUTABLE:FILEPATH=\"<path to gperf executable>\" .')")
+    message(FATAL_ERROR "Could NOT find gperf. Add path to gperf executable to PATH environment variable or specify it manually using GPERF_EXECUTABLE option, i. e. 'cmake -DGPERF_EXECUTABLE:FILEPATH=\"<path to gperf executable>\"'.")
   endif()
 
   set(GPERF_FILES