Added in commit cbefd24f0aee ("tools build: Add test to check if
slang.h is in /usr/include/slang/") this feature was to fix build
support on now unsupported versions of RHEL 5 and 6. As 6 years has
passed let's remove the workaround.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/build/feature/Makefile                       | 4 ----
 tools/build/feature/test-libslang-include-subdir.c | 7 -------
 tools/perf/Makefile.config                         | 9 ++-------
 tools/perf/ui/libslang.h                           | 4 ----
 4 files changed, 2 insertions(+), 22 deletions(-)
 delete mode 100644 tools/build/feature/test-libslang-include-subdir.c

diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index fd304dc2aafd..a4b1e11c5807 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -33,7 +33,6 @@ FILES=                                          \
          test-libperl.bin                       \
          test-libpython.bin                     \
          test-libslang.bin                      \
-         test-libslang-include-subdir.bin       \
          test-libtraceevent.bin                 \
          test-libcpupower.bin                   \
          test-libtracefs.bin                    \
@@ -229,9 +228,6 @@ $(OUTPUT)test-libunwind-debug-frame-aarch64.bin:
 $(OUTPUT)test-libslang.bin:
 	$(BUILD) -lslang
 
-$(OUTPUT)test-libslang-include-subdir.bin:
-	$(BUILD) -lslang
-
 $(OUTPUT)test-libtraceevent.bin:
 	$(BUILD) -ltraceevent
 
diff --git a/tools/build/feature/test-libslang-include-subdir.c b/tools/build/feature/test-libslang-include-subdir.c
deleted file mode 100644
index 3ea47ec7590e..000000000000
--- a/tools/build/feature/test-libslang-include-subdir.c
+++ /dev/null
@@ -1,7 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <slang/slang.h>
-
-int main(void)
-{
-	return SLsmg_init_smg();
-}
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index b0e15721c5a5..6e7c057b8ecf 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -773,15 +773,10 @@ endif
 
 ifndef NO_SLANG
   ifneq ($(feature-libslang), 1)
-    ifneq ($(feature-libslang-include-subdir), 1)
-      $(warning slang not found, disables TUI support. Please install slang-devel, libslang-dev or libslang2-dev)
-      NO_SLANG := 1
-    else
-      CFLAGS += -DHAVE_SLANG_INCLUDE_SUBDIR
-    endif
+    $(warning slang not found, disables TUI support. Please install slang-devel, libslang-dev or libslang2-dev)
+    NO_SLANG := 1
   endif
   ifndef NO_SLANG
-    # Fedora has /usr/include/slang/slang.h, but ubuntu /usr/include/slang.h
     CFLAGS += -DHAVE_SLANG_SUPPORT
     EXTLIBS += -lslang
     $(call detected,CONFIG_SLANG)
diff --git a/tools/perf/ui/libslang.h b/tools/perf/ui/libslang.h
index 1dff3020e9d5..6722561e0458 100644
--- a/tools/perf/ui/libslang.h
+++ b/tools/perf/ui/libslang.h
@@ -15,11 +15,7 @@
 #define ENABLE_SLFUTURE_CONST 1
 #define ENABLE_SLFUTURE_VOID 1
 
-#ifdef HAVE_SLANG_INCLUDE_SUBDIR
-#include <slang/slang.h>
-#else
 #include <slang.h>
-#endif
 
 #define SL_KEY_UNTAB 0x1000
 
-- 
2.51.0.618.g983fd99d29-goog

On Thu, Oct 02, 2025 at 07:27:33PM -0700, Ian Rogers wrote:
> Added in commit cbefd24f0aee ("tools build: Add test to check if
> slang.h is in /usr/include/slang/") this feature was to fix build
> support on now unsupported versions of RHEL 5 and 6. As 6 years has
> passed let's remove the workaround.

Thanks, applied to perf-tools-next,

- Arnaldo