I am uploading a LowNMU to convert this package. debdiff attached.
diff -Nru cbmplugs-1.2.2/cbmplugs.h cbmplugs-1.2.2/cbmplugs.h
--- cbmplugs-1.2.2/cbmplugs.h 2022-12-09 23:26:50.000000000 +0100
+++ cbmplugs-1.2.2/cbmplugs.h 2009-12-01 16:15:33.000000000 +0100
@@ -33,7 +33,7 @@
GimpParam **return_vals)
#endif
-typedef enum {
+enum {
KOALA = 0x0,
ADVOCP,
OCP,
diff -Nru cbmplugs-1.2.2/debian/changelog cbmplugs-1.2.2/debian/changelog
--- cbmplugs-1.2.2/debian/changelog 2022-12-09 23:26:50.000000000 +0100
+++ cbmplugs-1.2.2/debian/changelog 2022-12-09 23:23:25.000000000 +0100
@@ -1,3 +1,10 @@
+cbmplugs (1.2.2-1.2) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Convert to 3.0 source format. (Closes: #1007558)
+
+ -- Bastian Germann <b...@debian.org> Fri, 09 Dec 2022 23:23:25 +0100
+
cbmplugs (1.2.2-1.1) unstable; urgency=medium
* Non-maintainer upload.
diff -Nru cbmplugs-1.2.2/debian/patches/cbmplugs.h.patch
cbmplugs-1.2.2/debian/patches/cbmplugs.h.patch
--- cbmplugs-1.2.2/debian/patches/cbmplugs.h.patch 1970-01-01
01:00:00.000000000 +0100
+++ cbmplugs-1.2.2/debian/patches/cbmplugs.h.patch 2022-12-09
23:23:25.000000000 +0100
@@ -0,0 +1,13 @@
+Description: Add typedef definition
+---
+--- cbmplugs-1.2.2.orig/cbmplugs.h
++++ cbmplugs-1.2.2/cbmplugs.h
+@@ -33,7 +33,7 @@
+ GimpParam **return_vals)
+ #endif
+
+-enum {
++typedef enum {
+ KOALA = 0x0,
+ ADVOCP,
+ OCP,
diff -Nru cbmplugs-1.2.2/debian/patches/series
cbmplugs-1.2.2/debian/patches/series
--- cbmplugs-1.2.2/debian/patches/series 1970-01-01 01:00:00.000000000
+0100
+++ cbmplugs-1.2.2/debian/patches/series 2022-12-09 23:23:25.000000000
+0100
@@ -0,0 +1 @@
+cbmplugs.h.patch
diff -Nru cbmplugs-1.2.2/debian/source/format
cbmplugs-1.2.2/debian/source/format
--- cbmplugs-1.2.2/debian/source/format 1970-01-01 01:00:00.000000000 +0100
+++ cbmplugs-1.2.2/debian/source/format 2022-12-09 23:23:14.000000000 +0100
@@ -0,0 +1 @@
+3.0 (quilt)
