This patch is from the upstream pull request
https://github.com/chadaustin/sajson/pull/54.
It fixes linking with GCC.

diff --git a/include/sajson.h b/include/sajson.h
index 8b4e05a..1bd045b 100644
--- a/include/sajson.h
+++ b/include/sajson.h
@@ -138,12 +138,17 @@ constexpr inline size_t make_element(tag t, size_t value) {
 // header. This trick courtesy of Rich Geldreich's Purple JSON parser.
 template <typename unused = void>
 struct globals_struct {
+    static const unsigned char parse_flags[256];
+};
+typedef globals_struct<> globals;
+
 // clang-format off
 
     // bit 0 (1) - set if: plain ASCII string character
     // bit 1 (2) - set if: whitespace
     // bit 4 (0x10) - set if: 0-9 e E .
-    constexpr static const uint8_t parse_flags[256] = {
+    template <typename unused>
+    const unsigned char globals_struct<unused>::parse_flags[256] = {
      // 0    1    2    3    4    5    6    7      8    9    A    B    C    D    E    F
         0,   0,   0,   0,   0,   0,   0,   0,     0,   2,   2,   0,   0,   2,   0,   0, // 0
         0,   0,   0,   0,   0,   0,   0,   0,     0,   0,   0,   0,   0,   0,   0,   0, // 1
@@ -162,15 +167,13 @@ struct globals_struct {
     };
 
 // clang-format on
-};
-typedef globals_struct<> globals;
 
-constexpr inline bool is_plain_string_character(char c) {
+inline bool is_plain_string_character(char c) {
     // return c >= 0x20 && c <= 0x7f && c != 0x22 && c != 0x5c;
     return (globals::parse_flags[static_cast<unsigned char>(c)] & 1) != 0;
 }
 
-constexpr inline bool is_whitespace(char c) {
+inline bool is_whitespace(char c) {
     // return c == '\r' || c == '\n' || c == '\t' || c == ' ';
     return (globals::parse_flags[static_cast<unsigned char>(c)] & 2) != 0;
 }
='range'>range</option>
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<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=58416091c03ce583e05163b3e0d90aaa790be647'>root</a>/<a href='/guix/log/.patman?id=58416091c03ce583e05163b3e0d90aaa790be647'>.patman</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/.patman?id=58416091c03ce583e05163b3e0d90aaa790be647&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-10-22 16:09:04 -0400'>2023-10-22</span></td><td><a href='/guix/commit/.patman?id=f44fa21c3ec1d9bf1b9da009e1c795942bf654eb'>gnu: patman: Apply patch for new Change-Id setting.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/bootloaders.scm (u-boot) [source]: Apply patch.
* gnu/packages/patches/u-boot-patman-change-id.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.
* .patman (keep_change_id): Use it.

Series-changes: 3
 - New commit
Change-Id: I33c03013f6a260b5f5d80212b7b6ebe8a3f97efa
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-05-01 12:39:11 -0400'>2023-05-01</span></td><td><a href='/guix/commit/.patman?id=f21007ce4aceeacf5bbfc7cd45d526073141f194'>.patman: Remove get_maintainer_script option.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is now handled at the level of git via its new '--header-cmd' option,
which produces X-Debbugs-CC headers.

* .patman (get_maintainer_script): Delete option.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-02-25 23:10:59 -0500'>2023-02-25</span></td><td><a href='/guix/commit/.patman?id=cb0d8100b288b5b0d130820207db17764b7d2140'>.patman: Ignore bad tags.</a><span class='msg-avail'>...<span class='msg-tooltip'>The feature is not used in Guix, and it produces extraneous warnings.

* .patman (ignore_bad_tags): Set option to True.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-12-28 15:36:33 -0500'>2022-12-28</span></td><td><a href='/guix/commit/.patman?id=fde5af3962c8fafc5d20e5d742cc7aea907f3563'>.patman: New configuration file.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .patman: New file.

Series-to: 60218@debbugs.gnu.org
Series-cc: rekado@elephly.net, othacehe@gnu.org
Series-version: 2
</span></span></td><td>Maxim Cournoyer</td></tr>