diff --git a/steps/SHA256SUMS.pkgs b/steps/SHA256SUMS.pkgs
index 58186b61..93ac1ea8 100644
--- a/steps/SHA256SUMS.pkgs
+++ b/steps/SHA256SUMS.pkgs
@@ -55,7 +55,7 @@ ab8b5b92de4780b085d8bc7e98ee72ad5ba9c07b26690c579c559b5cc21817eb  gc-8.0.4_0.tar
 073c34853a2a7d221028d77029105d91a81fc82c2000bc171880270ad69fb4ea  gcc-13.3.0_0.tar.bz2
 64052d4b2ad1ac405455767b3ac09b77c31d90c38b1d69bfc0922902bd943a2d  gcc-4.0.4_0.tar.bz2
 da88bb5900f33c1caca9180784e47367e64ec9f258182a147d84168540de1450  gcc-4.0.4_1.tar.bz2
-cbbc193d4bef0b9ac9e4ba0111009297da66bc65de12c9f07b14d3f0d3be9688  gcc-4.7.4_0.tar.bz2
+325206b9d09cba81929a13a9ef23058bca3f37a0a82341de15780952e6ea9538  gcc-4.7.4_0.tar.bz2
 6b5236819c5963d33dffa022142df70644dbc1960adcb4456017112cf9b79f5b  gettext-0.21_0.tar.bz2
 309282ba840f80b5e10897b1221f3ff3329b9e05b982c788d03652f411974524  gmp-6.2.1_0.tar.bz2
 e89c5a38c49f2beb959e51732ff29bcf3652945e4f1c2bf70d39310c22b0c58f  gperf-3.1_0.tar.bz2
diff --git a/steps/gcc-10.5.0/pass1.sh b/steps/gcc-10.5.0/pass1.sh
index 6059c121..f8596a12 100755
--- a/steps/gcc-10.5.0/pass1.sh
+++ b/steps/gcc-10.5.0/pass1.sh
@@ -134,11 +134,11 @@ src_prepare() {
 
     # Regenerate crc table in libiberty/crc32.c
     pushd libiberty
-    sed -n -e '38,65p' crc32.c > crcgen.c
+    sed -n '/^   #include <stdio.h>/,/^   \}$/p' crc32.c > crcgen.c
     gcc -o crcgen crcgen.c
-    head -n 69 crc32.c > crc32.c.new
+    sed '/crc_v3\.txt/{n; q}' crc32.c > crc32.c.new
     ./crcgen >> crc32.c.new
-    tail -n +138 crc32.c >> crc32.c.new
+    sed '1,/^};$/d' crc32.c >> crc32.c.new
     mv crc32.c.new crc32.c
     popd
 
diff --git a/steps/gcc-13.3.0/pass1.sh b/steps/gcc-13.3.0/pass1.sh
index 8ec52ab8..90e62903 100755
--- a/steps/gcc-13.3.0/pass1.sh
+++ b/steps/gcc-13.3.0/pass1.sh
@@ -170,11 +170,11 @@ src_prepare() {
 
     # Regenerate crc table in libiberty/crc32.c
     pushd libiberty
-    sed -n -e '38,65p' crc32.c > crcgen.c
+    sed -n '/^   #include <stdio.h>/,/^   \}$/p' crc32.c > crcgen.c
     gcc -o crcgen crcgen.c
-    head -n 69 crc32.c > crc32.c.new
+    sed '/crc_v3\.txt/{n; q}' crc32.c > crc32.c.new
     ./crcgen >> crc32.c.new
-    tail -n +138 crc32.c >> crc32.c.new
+    sed '1,/^};$/d' crc32.c >> crc32.c.new
     mv crc32.c.new crc32.c
     popd
 
diff --git a/steps/gcc-4.7.4/pass1.sh b/steps/gcc-4.7.4/pass1.sh
index d8166cae..44664043 100755
--- a/steps/gcc-4.7.4/pass1.sh
+++ b/steps/gcc-4.7.4/pass1.sh
@@ -146,11 +146,11 @@ src_prepare() {
 
     # Regenerate crc table in libiberty/crc32.c
     pushd libiberty
-    sed -n -e '39,66p' crc32.c > crcgen.c
+    sed -n '/^   #include <stdio.h>/,/^   \}$/p' crc32.c > crcgen.c
     gcc -o crcgen crcgen.c
-    head -n 70 crc32.c > crc32.c.new
+    sed '/crc_v3\.txt/{n; q}' crc32.c > crc32.c.new
     ./crcgen >> crc32.c.new
-    tail -n +139 crc32.c >> crc32.c.new
+    sed '1,/^};$/d' crc32.c >> crc32.c.new
     mv crc32.c.new crc32.c
     popd