Adding #include <cstdint> to src/SerialzedValues.hpp and src/SerializedValues.cpp has fixed the issue.

Here's the error log from pip:

[ 36%] Building CXX object src/CMakeFiles/libopencc.dir/PhraseExtract.cpp.o
[ 38%] Building CXX object src/CMakeFiles/libopencc.dir/SerializedValues.cpp.o
In file included from /tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:23:
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.hpp:47:36: error: ‘uint16_t’ was not declared in this scope
47 | std::vector<uint16_t>* valueBytes,
| ^~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.hpp:23:1: note: ‘uint16_t’ is defined in header ‘’; this is probably fixable by adding ‘#include ’
22 | #include "SerializableDict.hpp"
+++ |+#include
23 |
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.hpp:47:44: error: template argument 1 is invalid
47 | std::vector<uint16_t>* valueBytes,
| ^
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.hpp:47:44: error: template argument 2 is invalid
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.hpp:48:24: error: ‘uint32_t’ has not been declared
48 | uint32_t* valueTotalLength) const;
| ^~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.hpp:48:24: note: ‘uint32_t’ is defined in header ‘’; this is probably fixable by adding ‘#include ’
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp: In member function ‘virtual void opencc::SerializedValues::SerializeToFile(FILE*) const’:
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:51:15: error: ‘uint16_t’ was not declared in this scope
51 | std::vector<uint16_t> valueBytes;
| ^~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:24:1: note: ‘uint16_t’ is defined in header ‘’; this is probably fixable by adding ‘#include ’
23 | #include "SerializedValues.hpp"
+++ |+#include
24 |
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:51:23: error: template argument 1 is invalid
51 | std::vector<uint16_t> valueBytes;
| ^
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:51:23: error: template argument 2 is invalid
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:52:3: error: ‘uint32_t’ was not declared in this scope
52 | uint32_t valueTotalLength = 0;
| ^~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:52:3: note: ‘uint32_t’ is defined in header ‘’; this is probably fixable by adding ‘#include ’
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:53:44: error: ‘valueTotalLength’ was not declared in this scope
53 | ConstructBuffer(&valueBuf, &valueBytes, &valueTotalLength);
| ^~~~~~~~~~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:55:11: error: expected ‘;’ before ‘numItems’
55 | uint32_t numItems = static_cast<uint32_t>(lexicon->Length());
| ^~~~~~~~~
| ;
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:56:20: error: ‘numItems’ was not declared in this scope
56 | WriteInteger(fp, numItems);
| ^~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:65:13: error: expected ‘;’ before ‘numValues’
65 | uint16_t numValues = static_cast<uint16_t>(entry->NumValues());
| ^~~~~~~~~~
| ;
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:66:22: error: ‘numValues’ was not declared in this scope
66 | WriteInteger(fp, numValues);
| ^~~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:68:18: error: expected ‘;’ before ‘i’
68 | for (uint16_t i = 0; i < numValues; i++) {
| ^~
| ;
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:68:26: error: ‘i’ was not declared in this scope
68 | for (uint16_t i = 0; i < numValues; i++) {
| ^
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:69:15: error: expected ‘;’ before ‘numValueBytes’
69 | uint16_t numValueBytes = valueBytes[valueCursor++];
| ^~~~~~~~~~~~~~
| ;
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:70:24: error: ‘numValueBytes’ was not declared in this scope; did you mean ‘valueBytes’?
70 | WriteInteger(fp, numValueBytes);
| ^~~~~~~~~~~~~
| valueBytes
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:63:42: warning: unused variable ‘entry’ [-Wunused-variable]
63 | for (const std::unique_ptr& entry : lexicon) {
| ^~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:62:10: warning: unused variable ‘valueCursor’ [-Wunused-variable]
62 | size_t valueCursor = 0;
| ^~~~~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp: In static member function ‘static std::shared_ptropencc::SerializedValues opencc::SerializedValues::NewFromFile(FILE)’:
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:80:3: error: ‘uint32_t’ was not declared in this scope
80 | uint32_t numItems = ReadInteger<uint32_t>(fp);
| ^~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:80:3: note: ‘uint32_t’ is defined in header ‘’; this is probably fixable by adding ‘#include ’
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:83:11: error: expected ‘;’ before ‘valueTotalLength’
83 | uint32_t valueTotalLength = ReadInteger<uint32_t>(fp);
| ^~~~~~~~~~~~~~~~~
| ;
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:85:22: error: ‘valueTotalLength’ was not declared in this scope
85 | valueBuffer.resize(valueTotalLength);
| ^~~~~~~~~~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:94:16: error: expected ‘;’ before ‘i’
94 | for (uint32_t i = 0; i < numItems; i++) {
| ^~
| ;
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:94:24: error: ‘i’ was not declared in this scope
94 | for (uint32_t i = 0; i < numItems; i++) {
| ^
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:94:28: error: ‘numItems’ was not declared in this scope
94 | for (uint32_t i = 0; i < numItems; i++) {
| ^~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:96:5: error: ‘uint16_t’ was not declared in this scope
96 | uint16_t numValues = ReadInteger<uint16_t>(fp);
| ^~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:96:5: note: ‘uint16_t’ is defined in header ‘’; this is probably fixable by adding ‘#include ’
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:99:18: error: expected ‘;’ before ‘j’
99 | for (uint16_t j = 0; j < numValues; j++) {
| ^~
| ;
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:99:26: error: ‘j’ was not declared in this scope
99 | for (uint16_t j = 0; j < numValues; j++) {
| ^
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:99:30: error: ‘numValues’ was not declared in this scope; did you mean ‘values’?
99 | for (uint16_t j = 0; j < numValues; j++) {
| ^~~~~~~~~
| values
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:101:15: error: expected ‘;’ before ‘numValueBytes’
101 | uint16_t numValueBytes = ReadInteger<uint16_t>(fp);
| ^~~~~~~~~~~~~~
| ;
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:102:23: error: ‘numValueBytes’ was not declared in this scope
102 | pValueBuffer += numValueBytes;
| ^~~~~~~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp: At global scope:
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:113:52: error: ‘uint16_t’ was not declared in this scope
113 | std::vector<uint16_t>* valueBytes,
| ^~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:113:52: note: ‘uint16_t’ is defined in header ‘’; this is probably fixable by adding ‘#include ’
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:113:60: error: template argument 1 is invalid
113 | std::vector<uint16_t>* valueBytes,
| ^
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:113:60: error: template argument 2 is invalid
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:114:40: error: ‘uint32_t’ has not been declared
114 | uint32_t* valueTotalLength) const {
| ^~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:114:40: note: ‘uint32_t’ is defined in header ‘’; this is probably fixable by adding ‘#include ’
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp: In member function ‘void opencc::SerializedValues::ConstructBuffer(std::string*, int*, int*) const’:
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:120:40: error: ‘uint32_t’ does not name a type
120 | valueTotalLength += static_cast<uint32_t>(value.length()) + 1;
| ^~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:120:40: note: ‘uint32_t’ is defined in header ‘’; this is probably fixable by adding ‘#include ’
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:129:19: error: request for member ‘push_back’ in ‘ valueBytes’, which is of non-class type ‘int’
129 | valueBytes->push_back(static_cast<uint16_t>(value.length() + 1));
| ^~~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:129:41: error: ‘uint16_t’ does not name a type
129 | valueBytes->push_back(static_cast<uint16_t>(value.length() + 1));
| ^~~~~~~~
/tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/src/SerializedValues.cpp:129:41: note: ‘uint16_t’ is defined in header ‘’; this is probably fixable by adding ‘#include ’
make[2]: *** [src/CMakeFiles/libopencc.dir/build.make:247: src/CMakeFiles/libopencc.dir/SerializedValues.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:1242: src/CMakeFiles/libopencc.dir/all] Error 2
make: *** [Makefile:166: all] Error 2
building libopencc into /tmp/pip-install-mnbca_ea/opencc_8490b9e6c2f94693bf13978fd6d38672/build/python
Traceback (most recent call last):
File "/home/user/.local/share/pyenv/lib/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 389, in
main()
~~~~^^
File "/home/user/.local/share/pyenv/lib/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 373, in main
json_out["return_val"] = hook(**hook_input["kwargs"])
~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/.local/share/pyenv/lib/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 280, in build_wheel
return _build_backend().build_wheel(
~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
wheel_directory, config_settings, metadata_directory

.... (PIP backtrace)